Ben bought a cell phone that came in a box shaped like a rectangle prism. 5 inches long by 3 inches wide by 3 inches high. What is the surface area of the box?

12/11c

or

12

c

11

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft