Write the number in standard notation. 6.43 * 10^-4

a. 0.0000643

b. - 257.2

c. 0.000643

d. 0.00643

What is the value 1/2 * 3+5.2y when x=2 and y=3

1. The monthly rents for studio apartments in a certain city have a mean of $920 and a standard deviation of $190. Random samples of size 25 are drawn from the population and the mean of each sample is determined.

What is 207 round to the nearest ten

Find the distance between y=4x+2, y=4x-3

The second term of a/b=x/y is x

1. Jason saves $15 for every $125 he earns. What percent of his earnings does Jason save? 2. If Jason earns $450 this week and saves at his usual rate, how much money will he deposit into his savings account? Type your answer below:

What is the value of c so that x^2 + 17x + c is a perfect square trinomial?

The following regular polygon has 15 sides. This distance from its center to any given vertex is 12 inches. Which of the following is the best approximation for its perimeter?

Estimate: √106 A. 9 B. 10 C. 11 D. 12

Math! Multiple Choice! Question 1 d/5 = 4 A. d = 20 B. d = 4/5 C. d = 5/4 Question 2 2 1/4 r = 10 r = 4 3/4 r = 4 2/5 r = 4 4/9 Question 3 h/26 = 5 h = 120 h = 130 h = 140 Question 4 6/7 k = 6 k = 7 k = 6 6/7 k = 6 I do Brainliest!