Does anyone know the answer to this

The bottom edge of the end triangle has a length that can be computed from the Pythagorean theorem.
.. √(15^2 -12^2) = √(225 -144) = √81 = 9

Then the perimeter of the end triangle is 9 +12 +15 = 36. The lateral area is the product of this and the length of the prism:
.. lateral area = 36*20 = 720

The two end triangles will have a total area of
.. end area = 9*12 = 108

The surface area is then
.. surface area = lateral area + end area
.. = 720 +108 = 828 . . . . . square units

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

when multiplying or dividing by a negative on both sides you have to flip the inequality sign. this rule only applies to multiplying or dividing by a negative number in inequality equations. this rule is really important.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice