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Dr. Jane
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Dr. Jane
Answers (510)
You are looking for reduced speeding. I am assuming "md" indicates the mean of the difference. Ho is correct by H1 should be md
You have to find the z-score for both 50 and 70 minutes. Change the 1.02 hours to 61.2 minutes for the mean. z = (50 -61.2)/9 do the same for the 70 minutes. go to a standard z-table and find the area between those two values. Do the same thing for B. Your
for the second one you have b^2 under a radical sign with an index of 3 (or root of 3) You have some typos in the first one.. but if I am a reading it correctly. (w+9)^3 = -56 take the cube root of both sides w + 9 = cube root of (-56) subtract 9.. the 9
John's distance = 10t Fred's distance = 12t John + Fred distance = 55 so 55 = 10t + 12 t You can find time in hours by solving the equation.
Use the formula that I gave you in the previous post.
Area of a Triangle = 1/2 x b x h If your units are the same then just enter them into the formula.
(90, 220) and (76, 178) You have two points, so you can write an equation of a straight line in the form or y = mx + b First find the slope: m =(220-178)/(90-76) Once you have the slope. Use it and one of the points to find the equation of the line. To
12 x 14 =168 square feet. If the pavers were 1 foot by 1 foot we would need 168 pavers BUT.. your paver is 8 inches which is 8/12 or 2/3 of a foot. It is 2/3 times 2/3 or 4/9 square ft 168 divided by 4/9 which is the same as 168 times 9/4 That will get you
See the one I just did. Here, you will have to change 960 m to mm 1000 mm = 1 meter
First change cm to mm 350 cm = 3500 mm Area = L x W 3500mm = L(50mm) Divide to solve for L
There are 24 marbles 16 are either green or red 16/24 reduce to get the probability.
Check the links below. I answered this one last night.
This isn't math... probably the science people won't look at it. This looks like biology to me.
1/6 times 30 = 5 pennies 1/5 times 30 = _____ nickels 1/3 times 30 = _______dimes Add up your coins and subtract from 30 to find the number of quarters.
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I did this a minute ago.
Is this (x - 7) divided by (7x - 9)?
Law of exponents says that you can distibute your power to when multiplying so you would have- 4^2 x 10^-10 I multiplied the two powers.. 4^*1*2) x 10^(-5*2) 16 x 10^-10 I don't know if your teacher wants you to write this in a different form or not. If
You can change both fractions to 20ths and then compare the fractions. 4/5 multiply by 4/4 2/4 multiply by 5/5
Perimeter = L + L + W + W or P = 2L + 2W L = 5+ 2w P = 2(5+2W) + 2W I replaces the L in the original formula with the 5 + 2w because that equals L according to the problem. 34 = 10 + 4W + 2W Just solve for W. And then you can find L.
Which fraction is larger? Since the denominators are the same, just compare the numerators.
-4x >8 excuse my typo x < -2 Lets pretend this is an equation for one minute (x-3)/(x+1) = 5 Put in the -2 (-2-3/(-2-1) =5 -5/-1 =5 We are correct there... so.. Since we have an inequality, we have two choices for the final answer. x> -2 or x > -2 If we
1. you have to add 4 to each part of the inequality and then divide by -4. That will cause the same reversal as above. Be careful with that final answer. 2. Multiply each part by -1 25>x>10 You have to turn this around for your final answer.. Like we did
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3/12 Reduce this fraction to lowest terms.
Here are a couple examples for you 567,000 in scientific notation is 5.67 x10^5 You always have one number in fron to the decimal place (in the ones place) multiplied 10. If you need to make the number larger the exponet on the 10 is positive. If you need
For the ribbon problem 98 - 12(5) = length of ribbon.
Sam ate 1/4 of 8 is 1/4 x 8 = 2 slices There are 6 slices left.
This should be 3/4 of 12 or 3/4 times 12 = 9 sections
19/38 reduce to lowest terms as a fraction or express as a decimal
90% confidence interval indicates that 90% of the confidence intervals that you form using the same procedure will contain the true mean of the population. You had a sample and you are trying to predict the mean response from the total population. That is
The second man is travelling for 2 seconds. The first man is travelling for 3 seconds. acceleration due to gravity = 9.8m/sec^2 d = vt v = at we can combine to get d =at^2 a in this case is g. You can find the distance of each jumper and find the
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D is not right. Electrons move all the time around the nucleus. The travels are not in the nucleus, but they travel around. There are different theories one is that they are in orbitals like the planets around the earth. Really there is cloud of electrons
For the first one just add 7 to each part of the inequality. that will leave x alone in the middle. For the second one, this gets a little tricky. You have to divide each part of the inequality by -12. Whenever you multiply or divide and inequality by a
You have to look for a pattern. I would put them in order input 8 ___ 16 22 30 50 output___ 10 11 14 18 28
There is data for these 5 people before and after the class. You have two sets of data and since it is the same people in both groups this is a dependent test.
You cannot simplify if you have a sum of x + y under a square root. if you have xy under a square root, you can write it as square root of x times the square root of y.
I hope your other one didn't need matrices because..I did it the other way. 4 -1 -3 8 2 2 -1 3 6 1 -3 2 You want to manipulate the rows so that in the end, you end up with 1 0 0 a where a = the value for x 0 1 0 b where b = the value for y 0 0 1 c where c
Your goal is to go from 3 equations in 3 variables down to 2 equations in 2 variables. It is up to you to decide which variable you want to eliminate. I think I might try eliminating the y. Add the first two equations together. since the y's are equal and
Under the overall square root you have 3 - square root of 25-x^2 What is under the radical sign has to be positive. Domain is the X values that will result in a solution and not undefined. It looks like you can have x=-5 and x =5 because that will give a
Multiply both sides times x + 1 x-3 > 5x + 5 -4x > 2 x 5 -8/-4 >5 2 > 5 That is correct 2 is greater than 5.
z = (x - 32)/1.2 For 1: you have to use a z-table to find the value where 99% of the values are less than that number meaning that there is 1% in the upper tail. Z-tables to differ from book to book, be sure to read it carefully. Once you have that z-
Another approach is to use: y = mx + b You will have m, x and y. solve for b. Write an equation where you have a value for m and b. You can then figure out another x and y that will work in that equation.
I have to see the line shown. We need the slope of the line shown. Grant's line will have a slope that is a negative reciprocal of the line shown. for example if the line has a slope of -3, Grant's perpendicular line will be 1/3. To find the other point,
You can do this the same way that you would factor x^2 - x - 90 But.. this time we have x^4 and x^2 (x^2 -10)(x^2 +9)
48 is 16 x 3 Take the square root of 16 =4 4 square root of 3 Now look at n^9 that can be written as n times n^8 n^4 comes out and leaves n under the square root sign. your answer should be 4n^4 square root of (3n) One way to get an better understanding of
36/390 Probability can be represented as a reduced fraction or as a decimal
To find the square root of 140 I started with 14 times 10 then 7 times 2 times 2 times 5 I have a perfect square of 4 and take the square root which puts the 2 out in front of the square root. 2 times the square root of (35)
Can you prove it by side angle side? AB = BC BD = BD it is a shared side Angle ABD = Angle CBD We have 2 sides and the angle between those 2 sides. I drew a picture.
