What is the value of x in the proportion x + 1 / x+3 = 15 / 21

a. 4

b. 1/3

c. 1/4

d. 3

What is the standard deviation for the data set? 138, 129, 145, 134, 142, 159, 153, 142, 127 Express your answer as a decimal to the nearest tenth.

3x - 4y = - 5 y = 4x - 2 Is (1,2) a solution of the system?

Write a numerical expression. Then write words to match the expression

The movie theatre has 250 seats. 225 seats were sold for the current showing. What percent of the seats are empty?

Suppose that 16-ounce bags of chocolate chip cookies are produced with weights that follow a normal distribution with mean weight 16.1 ounces and standard deviation 0.1 ounce.

The worker received a salary of EUR 150 per month. For good work, his salary was increased by 12%. How much is the worker now getting?

A car dealer offers a 10% discount off the list price x for any car on the lot. At the same time, the manufacturer offers a $2,000 for each purchase of a car A. Write a function f (x) to represent the price after the discount. b.

What is the quotient (65y3 15y2 - 25y) : 5y? a. 13y2 3y - 5 b. 13y3 3y2 - 5y c. 13y2 - 3y 5 d. 13y2 - 3y - 5

Which angles are corresponding angles? check all that apply

An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period? A. (2d) / 3 B. (3d) / 4 C.