# sarah

Questions and answers by visitors named sarah

## Questions

1. ### A child is standing on a platform of a station.

A train travelling at 30m/s takes 3.0 secs to pass the child.What is the length of the train. a)10m-this was my answer b)27m c)30m d)90m

2. ### Shawn and his bike have a total mass of

51.1 kg. Shawn rides his bike 1.7 km in 10.7 min at a constant velocity. The acceleration of gravity is 9.8 m/s squared. What is Shawn’s kinetic energy? Answer in units of J.

5. ### The lengths QR, RP, and PQ in triangle PQR are often denoted p, q, and r, respectively.

What do the formulas 1/2 pq sinR and 1/2 qr sin P mean? After you justify the equation 1/2 pq sinR = 1/2 qr sin P, simplify it to a familiar form.

6. ### Four darts are thrown at this dartboard. If all four darts hit the board, how many different point totals are possible?

there are 4 circles with point totals: working out from the middle bulls eye.. bulls eye = 9 2nd circle = 7 3rd circle = 4 outter circle

14. ### 1)when a certain polynomial is divided by x - 3, the quotient is x^2+2x-5 and the remainder is -3. what is the polynomial

2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29x-x^3-40)/(-3+x) b)(6+7x-11x^2-2x^3)/(x+9)

15. ### An isosceles triangle has two 10.0-inch sides and a 2w-inch side. Find the radius of the inscribed circle of this triangle, in the cases w = 5.00, w = 6.00, and w = 8.00.

Then Write an expression for the inscribed radius r in terms of the variable w , then

16. ### find the number of integers between 32 and 395 that are divisible by 6

find their sum

18. ### Which is the difference between a renewable resource and a nonrenewable resource?

A. A renewable resource cannot be replaced for many lifetimes, and a nonrenewable resource can be replaced in the near future. B. A renewable resource is something that can be

19. ### Belinda wants to invest \$1000. The table below shows the value of her investment under two different options for three different years:

Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A:

20. ### Given the function f(x) = 2(3)^x, Section A is from x = 0 to x = 1 and Section B is from x = 2 to x = 3.

Part A: Find the average rate of change of each section. Part B: How many times greater is the average rate of change of Section B than Section A?

Writ

31. ### Austin is creating a new trail mix by

combining two of his best­selling blends. A pineapple­coconut­macadamia (pcm) mix that sells for \$18/kg and a banana­papayapeanut (bpp) mix that sells for \$10/kg. Write the equations and find the point of

32. ### One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury(II) oxide is reduced to mercury.

HgO(s) + H2O( ) + 2 e–  Hg( ) + 2 OH–(aq) If 2.3  10–5 amperes flows continuously for 1200 days, what mass of Hg( ) is

35. ### If the equilibrium constant for a one-electron redox reaction at 298 K is 7.8 104, calculate the corresponding ÄG° and E°cell.

how would i set this problem up?

40. ### i was wondering if i did this right

A cannon ball is shot from a cannon on top of a hill that is 73.5 meters above sea level. The cannon ball leaves the cannon with a velocity of 9.8 m/s. Write and solve a quadratic equation to determine when the cannon

47. ### (10 Squar root -13)(-5 square root -5)

put in standard form a+bi I really don't understand square roots so can you show me how to do these please

50. ### let f be function given by f(x)= Ln(x)/x for all x> 0. the dervative of f is given by f'(x)= (1 - Ln(x))/x squared.

a) write equation for the line tangent to the graph of f at x=e squared b) Find the x-coordinate of the critical point of f. Determine wheter

58. ### The senior classes at Spanish River and Atlantic planned separate trips to Universal Studios. The senior class at

Spanish River rented and filled 1 van and 6 buses with 372 students. Atlantic rented and filled 4 vans and 12 buses with 780 students. Each van

60. ### Winds, air pressure, evaporation, and the angle of the sun shape the daily

Choose... of each place.

68. ### The sum of 21 and Greg's score is 57

Use the variable g to represent Greg's score.

72. ### 1. A stopwatch starts while race car travels at 7 m/s from the pit area and accelerates at a uniform rate to a speed of 30 m/s in 19 s moving on a circular track of radius 511 m.

Assuming constant tangential acceleration, find (a) the tangential

73. ### 1.25 +

410 410 −35 −35

77. ### The fuel tank in Alisha’s car holds

16.5 gallons, and the car gets 24miles per gallon for city driving and 30miles per gallon for highway driving. Which inequality represents the range of the total number of miles, m, Alisha can drive on a tank of gas?

80. ### 2HBr(g) + Cl2(g)2HCl(g) + Br2(g)

ΔH° = -81.1 kJ and ΔS° = -1.2 J/K The maximum amount of work that could be done when 2.05 moles of HBr(g) react at 274 K, 1 atm is...?

81. ### A project is expected to be completed in 16 days. The variance of the project duration is 3 days.

(8 points) a. What is the probability that it will be completed in 18 days? b. What is the probability that it will take more than 19 days to finish? c. What

85. ### A class consists of 45 students. Ten of these students received an "A" for the final exam. Five students are selected at random from this group.

a) What is the probability that three of the five students selected received an "A" for the final exam? b) What

86. ### The number of traffic accidents per day on a certain section of highway in the past was 4 accidents per day in average. Based on this,

a) What is the probability that there may be exactly two traffic accidents tomorrow? b) What is the probability that there

HELP

89. ### by studying the bones and teeth of the mastodon remains found on the manis farm, what where the scientists able to prove?

I NEED HELP!!!

91. ### Which of the following statements about Aborigines is false?

A. They were nomadic hunter-gatherers. B. They lived in small groups called clans. C. They used spears, nets, and boomerangs to hunt. D. They spoke one common language and had shared religious

93. ### Check 0/4 pts Retries 2

A bag contains 2 gold marbles, 7 silver marbles, and 26 black marbles. Someone offers to play this game: You randomly select one marble from the bag. If it is gold, you win \$4. If it is silver, you win \$2. If it is black, you lose \$1