CAN Someone please tell me the answers to these also don’t answer number seven

Acircle has a circumference of 28.36 units what is the diameter of the circle

Which expression is a perfect cube? a. x8 b. y24 c. m28 d. x64

Lines f and g are cut by the transversal d. the measure of 1 = 2x + 35 and the measure of 8 = 10x - 85. what value of x will show that lines f and g are parallel? a. 19 b. 26 c. 18 d. 15