50 POINTS! This figure is a tetrahedron. What is its surface area?

124.8 square units

249.6 square units

187.2 square units

312 square units

249.6 square units

Step-by-step explanation:

The surface area of a tetrahedron consists of 4 times the same areas. So we just need to get the area a of the triangle with the given height h = 10.4 and base length b = 12 which is . Multiply with 4 to get the whole thing.

1. x> -5

2. x< 8

step-by-step explanation:

1. 2x> -10

divide by 2 from both sides of equation.

2x/2> -10/2

simplify, to find the answer.

-10/2=-5

x> -5 is the correct answer.

2. 3x< 24

divide by 3 from both sides of equation.

3x/3< 24/3

simplify, to find the answer.

24/3=8

x< 8 is the correct answer.

i hope this you, and have a wonderful day!