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Erica

Questions and answers by Erica

Questions (399)

find the sum of each finite arithmetic series 8+9+10+...+15
1. 3 answers
2. 811 views
One of the five charateristics of living things is being able to reproduce. Do all living things have to have all
1. 3 answers
2. 636 views
The monthly revenue acheived by selling x boxes of candy is calculated to be x(5-0.05x)dollars. The wholesale cost of each box
1. 1 answer
2. 915 views
The surface ares S (in square meters) of a hot air ballon is given by s(r)=4 pi r^2 where r is radius of balloon (in meters). If
1. 1 answer
2. 553 views
the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is
1. 4 answers
2. 2,153 views
The function f(x)= x^4 is not one-to-one. Find a suitable restriction on the domain of f so that the new function that results
1. 1 answer
2. 650 views
The period T (in seconds) of a simple pendulum is a function of its length l (in feet), given by T(l) = 2pi sq root of l/g,
1. 1 answer
2. 1,312 views
The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles
1. 3 answers
2. 1,763 views
The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h
1. 4 answers
2. 7,353 views
A culture of bacteria obeys the law of unlimited growth. If 500 bacteria are present initially and there are 800 after 1 hour,
1. 2 answers
2. 759 views
The logistic growth model p(t)=0.90/1+3.5e^-0.339t relates the proportion of new personal computers sold @ Best Buy that have
1. 3 answers
2. 1,110 views
Solve eacy system of inequalities. If the system has no solution, say that it is inconsistant.x -y -z = 1 2x +3y +z = 2 3x +2y =
1. 1 answer
2. 420 views
find real numbers a,b,c so that the graph of the function y=ax^2+bx+c contains the points (-11,4), (2,3) , and (0,1)Write three
1. 1 answer
2. 771 views
solve each system of equations using matricesx+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I don't see how it is possible to even attempt a
1. 1 answer
2. 1,063 views
What international moral code, if any, is being violated by the Bank?What bank? What did "the Bank" do that might have violated
1. 1 answer
2. 407 views
a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the
1. 2 answers
2. 1,296 views
Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0
1. 3 answers
2. 1,853 views
lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of
1. 2 answers
2. 1,076 views
A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon
1. 5 answers
2. 8,873 views
Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees
1. 3 answers
2. 1,575 views
Find the general solution of the differential equation specified.1) dy/dt= 1/(ty+1+y+1) 2) dy/dx=sec y I got y(x)=arcsin(x) for
1. 1 answer
2. 840 views
What are the sectores of the economy?Since this is not my area of expertise, I searched Google under the key words "<I>economy
1. 1 answer
2. 719 views
waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash?The <b>correct
1. 2 answers
2. 710 views
What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?
1. 1 answer
2. 527 views
Can someone tell name 6 effects of ocean currents?Thanks Since this is not my area of expertise, I searched Google under the key
1. 1 answer
2. 554 views
How do I do a Bibliography for an interview?Thank you for using the Jiskha Homework Help Forum. Here are some sites on how to
1. 1 answer
2. 665 views
Why is it impossible to have an Arctic Circumpolar Current?http://www.whoi.edu/science/PO/arcticgroup/projects/proshjohnson-two-
1. 1 answer
2. 545 views
1. How do meteorologists forecast El Nino and La Nina?2. Effects of El Nino and La Nina with regards to ocean currents and air
1. 1 answer
2. 686 views
How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds
1. 2 answers
2. 698 views
Directions say that I have to solve and graph the equation using words.I have to include whether the lines are dotted or solid,
1. 1 answer
2. 513 views
Directions are that i have to solve the equation and graph it using words.I have to include whether itis a solid or dotted line
1. 1 answer
2. 532 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 1 answer
2. 421 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 2 answers
2. 529 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 3 answers
2. 786 views
Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them!Problems: 2.Your quiz grades are 19, 17, 20, and
1. 1 answer
2. 886 views
x^2+4
1. 3 answers
2. 251 views
x^2+4x^2+4 = (x + 2 i) (x - 2 i) Wouldn't you need a value for x? Or do u just have to make an expression? An expression for
1. 1 answer
2. 380 views
Why does covering and refrigerating food help reduce spoilage from mould?
1. 4 answers
2. 1,071 views
What were the key arguments for and against U.S. imperialism during the Spanish American War??
1. 2 answers
2. 816 views
How would I find the a for the equation y= a(x-h)^2+k. I'm looking at a graph, and I can solve for everything except for a. What
1. 5 answers
2. 386 views
How do you write a quadratic equation in standard form for a given set of zeros?
1. 4 answers
2. 3,749 views
Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What
1. 5 answers
2. 1,051 views
Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What
1. 5 answers
2. 556 views
find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>
1. 2 answers
2. 906 views
Assume that men constitute 49% of population in a country. Assumealso that among men there are 5% of color-blinded. Find the
1. 1 answer
2. 399 views
This is my english assignment, hope someone will look over it for me!! ThanksIdentify the phrase in the sentence below, and name
1. 3 answers
2. 587 views
I have did the corrections for my english homework I posted a few days ago. Can someone check it over again and give me some
1. 3 answers
2. 578 views
Indicate the gendr of the bracketed words. I tired them but I am not sure am I right or not. Please look over it and give me
1. 5 answers
2. 454 views
This is one of my english homework. Can someone have a look at it and give me some suqqestions. Thank you.The Summary of English
1. 2 answers
2. 1,141 views
This is a homework assignment for my Psychology course on Memory and learning.Find a Movie/video clip (1-3 mins)that demonstrate
1. 3 answers
2. 621 views
Four charges on a rectangle that is 6 cm by 3 cm. All but one of the corners has a positive charge. The magnitudes of the
1. 2 answers
2. 641 views
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this
1. 1 answer
2. 852 views
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this
1. 2 answers
2. 1,036 views
5(2n + 4) - 3(4n - 6) = 2(20 - n)I solved this equation and this is what I got. 10n + 20 - 12n + 18 = 40 - 2n -2n + 38 = 40 -2n
1. 3 answers
2. 734 views
What task component distinguishes the Wechsler Scales from the SBIS?
1. 1 answer
2. 1,030 views
what is n/15=120
1. 1 answer
2. 286 views
A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball
1. 4 answers
2. 2,826 views
What is a generalization for this set of polygons: square, hexagon and a pentagon
1. 3 answers
2. 1,237 views
a description of a specific macroeconomic phenomenon or event and how it has impacted you
1. 2 answers
2. 832 views
How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4
1. 1 answer
2. 256 views
If today is Tuesday, what integer stands for last Sunday?
1. 7 answers
2. 796 views
solve by elimination method 5x+2y=-13, 7x-3y=17
1. 2 answers
2. 1,034 views
The leg and cast in the figure below weigh 280 N, with the center of mass as indicated by the blue arrow in the diagram. The
1. 1 answer
2. 878 views
A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is
1. 4 answers
2. 3,912 views
graph the inequality on a plane3x+4y is less then or equal to 12
1. 2 answers
2. 476 views
graph the inequality on a plane3x+4y is less then or equal to 12
1. 1 answer
2. 362 views
A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius.(a) Find
1. 2 answers
2. 866 views
A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude
1. 3 answers
2. 1,061 views
The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately
1. 2 answers
2. 539 views
I have to find the function rule that goes with this table...X Y 2 8 4 18 7 33 9 43 12 57 I've been trying to figure it out for
1. 1 answer
2. 460 views
If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?
1. 1 answer
2. 329 views
A group of 56 randomly selected students have a mean score of 30.8 and astandard deviation of 4.5 on a placement test. Find a
1. 2 answers
2. 615 views
A group of 56 randomly selected students have a mean score of 30.8 and astandard deviation of ó = 4.5 on a placement test. Find
1. 2 answers
2. 1,058 views
Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 =
1. 2 answers
2. 547 views
What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
1. 4 answers
2. 2,847 views
Use implicit differentiation to find dy/dx.ln xy + 5x = 30
1. 2 answers
2. 1,165 views
Locate any relative extrema and inflection points.y = (ln x)/x
1. 1 answer
2. 476 views
Use the derivative to determine whether the function is strictly monotonic on its entire domain and therefore has an inverse
1. 3 answers
2. 1,147 views
Find the inverse of f(x) = (x+2)/x
1. 1 answer
2. 342 views
You need 50 pounds of two commodities costing $1.25 and$1.60 per pound.a) Verify that the total cost is y=1.25x + 1.60(50 - x),
1. 2 answers
2. 805 views
Find the area of the largest rectangle that can be inscribed under the curve y = e^(-x^2) in the first and second quadrants.
1. 1 answer
2. 759 views
Solve the equation for x.arcsin(sq. rt.(2x)) = arccos(sq. rt(x))
1. 1 answer
2. 335 views
Verify each identity.a) arcsin(-x) = -arcsin x; abs. val. (x) is less than or equal to 1. b) arccos(-x) = pi - arccos x; abs.
1. 1 answer
2. 376 views
Find the derivative of the function.f(x) = arctan (x/a)
1. 2 answers
2. 577 views
Find the derivative of the function.h(x) = x^2 arctan x
1. 1 answer
2. 433 views
Find the derivative of the function.y = x arccos x - (sq. rt. (1 - x^2))
1. 1 answer
2. 318 views
Verify the differentiation formula.d/dx[arcsin u] = u'/(sq. rt. (1-u^2))
1. 1 answer
2. 448 views
Find the integral of 2x/(x^2 + 6x + 13)dx
1. 2 answers
2. 606 views
The graph of y = 3x^2 - x^3 has a relative maximum at what point?
1. 3 answers
2. 1,944 views
A line through the origin rotates around the origin in such a way that the angle, θ, between the line and the positive x-axis
1. 1 answer
2. 745 views
If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?
1. 4 answers
2. 4,485 views
If t is measured in hours and f '(t) is measured in knots, then integral from 0 to 2 of f '(t)dt = ?(Note: 1 knot = 1 nautical
1. 1 answer
2. 899 views
How do you solve ∫sin(3x+4)dx?I got the -cos(3x+4) part, but do you have to integrate the 3x+4 too? Does chain rule apply?
1. 2 answers
2. 1,034 views
If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then
1. 4 answers
2. 1,061 views
If dy/dx = x²y², then d²y/dx² = ?
1. 4 answers
2. 2,459 views
Let f(x) be the function defined by f(x) = {x, x≤0x+1, x>0 The value of the integral of x(f(x))dx from -2 to 1 =?
1. 4 answers
2. 1,171 views
If, for all real number x, f(x) = g(x) + 5, then on any interval [a, b], what is the area of the region between the graphs of f
1. 2 answers
2. 867 views
The volume of the solid formed by revolving the region bounded by the graph of y = (x-3)² and the coordinate axes about the
1. 2 answers
2. 548 views
Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval
1. 4 answers
2. 6,616 views
Let f(t) = 1/t for t>0. For what value of t is f ' (t) equal to the average rate of change of f on [a,b]?
1. 1 answer
2. 396 views

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