Which two features of igneous rocks are determined by their cooling rate? color and shininess
shininess and hardness
hardness and crystal size
crystal size and rock texture

crystal size and rock texture     D

Step-by-step explanation:

:)

what level of math? also i don't need to be paid if i can you.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet