Ms Davis says that you can use the area of a a circle to figure out its circumference, but a student disagreed. Who is correct?Use Area= 78.5m to solve the problem and then explain with a paragraph who is correct?

The student is correct.

Step-by-step explanation:The circle's circumference is the distance around the circle.  To find out the circle's circumference, you will NEED the radius.  Without the radius OR diameter, there will be no way of telling what the circumference is with just the area.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1