posted by Anonymous .
Martina went shopping. She spent a fifth of what she had in her wallet and then a fifth of what remained. In all she spent $36. How much did she start with?
For what values of p could the expression 100 divided by p-squared -16 not be evaluated. Explain your answer.
let the amount she had be $x
then she spent (1/5) and (1/5)(4/5)x
the sum of that is 36.
Can you take it from there?
for your second part
remember that the only way that 100/(p^2-16) cannot have a value is when we divide by zero.
so when is p^2 - 16 = 0???
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