Answer:
3.08
Step-by-step explanation:
1 - 3/5 = 2/5
2/5 x 7.7 = 3.08
Type surface area of a triangular prism on google for a calculator
or height X Base side A X base side B X base side C
the base is the triangular side the height is the long part
D I got the phone call back in the phone with me a couple

you divide both the top and bottom number by the highest number that can go into both without giving you a decimal . the highest number that can go into both parts of the fraction is 7 . 56/7= 8 and 63/7 = 9 therefore the answer is