How to tell when to use positive or negative symbols when dividing?

Answers

Answer 1

Answer: Always look to the left of the number if there's a minus sign then it's negative. If it has nothing or a plus sign, then it is positive.

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I need help right away with the next problem.

Answers

Answer:

see below

Step-by-step explanation:

To convert the numbers to percentages, divide each number by the table total (80) and multiply by 100%. That is equivalent to multiplying each number by 1.25%. For example, 18·1.25% = 22.5% (middle table number).

Y=3(x-5)(x+4) please find the zeros (0)

Answers

Answer:

x=5,−4

Step-by-step explanation:

The roots (zeros) are the x values where the graph intersects the x-axis. To find the roots (zeros), replace y with 0 and solve for x.

The same sample of 25 seniors from the urban school district with the mean and standard deviation N(450, 100). A 95% confidence interval for µ for the population of seniors with a margin of error of ± 25 is used. What is the smallest sample size we can take to achieve this same margin of error?26

45

50

62

69

Answers

I have some notes here that might help you answer the problem in your own:

The formula to calculate a minimum sample size is as follows:

n = [z*s/E]^2

Where n is the sample size, z is the z value for the level of confidence chosen, s is the estimated standard deviation and E is the allowable error.

I hope my answer has come to your help. God bless and have a nice day ahead!

Which expression can be used to determine the reference angle for an angle, x, measuing 150 degrees

Answers

Answer:

see explanation

Step-by-step explanation:

150° is in the second quadrant.

To find the reference angle in the first quadrant subtract from 180°

reference angle = 180° - 150° = 30°

Answer:

-180-x

Step-by-step explanation:

The formula for perimeter of a rectangle is given by p = 2l + 2w, where p = perimeter, l = length, and w = width. solve the formula for w.

Answers

Perimeter formula
p = 2l + 2w

I reverse left-right side
2l + 2w = p

Move 2l to the right
2l + 2w = p
2w = p - 2l

Move 2 to the right
2w = p - 2l
w = (p - 2l)/2

Summary
p = 2l + 2w
2l + 2w = p
2w = p - 2l
w = (p-2l)/2

8x___=0.24

please help me with this-

Answers

Answer:

0.03

Step-by-step explanation:

8x=0.24

x=0.03

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