When stone hits the ground, it's height will be zero, and since we're finding the time that's required for the stone to hit the ground, we can set h = 0 and solve for t.
Suppose a greeting card is 4 inches long on one side about how long should the other side of the card be in order for it to be g
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x = volume of 10% solution to use in the mixture
y = volume of 25% solution to use
She wants a 200 mL solution, so x + y = 200.
The first solution contributes 0.10x mL of alcohol, while the second contributes 0.25y mL. Together, they make a solution with 0.20(x + y) = 0.20(200) = 40 mL of alcohol.