Is y=-3x^3 linear equation?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !