PLEASE HELP There are 76 students in the Breezewood Middle School chorus. The number of girls in the chorus is 13 more than twice the number of boys.

Write an expression that represents the number of girls in the chorus if b represents the number of boys.
Using your expression from Part A, write an equation that could be used to determine the number of girls and boys in the chorus. Hint: the only variable in your equation should be b.
Use your equation to determine the number of boys and girls in the chorus. Show your work.

What is the percent of increase for a population that changed from 438,000 to 561,000

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11