What is between -3/4 and 5/8

(a) -1
(b) -1/2
(c) 7/8
(d) 0.9

What is the simplified expression for 6(2(y+x))

Average acceleration: i have no idea how to do this.

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?