VERY URGENT PLZ HELP If f(x)=−x , then evaluate f(a−4) .

A) −9a+20

B) −9a+12

C) −a−20

D)−4

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet