7. Find the perimeter of the triangle with the side lengths of x+14, -X+7, and x-9. (2 Points)

8. Find the area of a rectangle with the following measurement:
(2 points)
length = 3x² - 6x + 5 and width = 5x - 8

7. Perimeter = x+12

8.  Area = 3x² +19x-8

Step-by-step explanation:

Perimeter -To calculate the perimeter of a triangle, add the length of its sides. For example, if a triangle has sides a, b, and c, then the perimeter of that triangle will be P = a + b + c.

Area -The area A of a rectangle is given by the formula, A=lw, where l is the length and w is the width.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: