Given that 9x–4y = 20. Find y when x= -2

Three coins are flipped. what is the probability that there will be at least two tails?

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?