Plz help m

y varies directly with x. If y = 15 when x = -18, find y when x = 1.6.

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Using inductive reasoning, what is the next two numbers in this set? 1,-7,13,-19 i got the numbers 14,-26 is that right?