17.vanessa simplifified an expression using the steps shown below

expression: 54+17+6

step 1: 17+54+6
step 2: 17+60
step: 77

which propety justifies steps 1

a. identitive
b. associative
c. commutative
d. distributive

Need on this geometry question. explain how you did it.

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Can someone me with these two circle theorem questions asap?