What is the answer for "1a*a=9a?"..please give me a correct answer 1a*a = 9a​

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

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done