The variables x and y are directly proportional, and y=4 when x=9. What is the value of y when x=18?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

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