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

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

What is the value of x when x + 7 = 21?