# Math

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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.

Thanks

• Math -

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?

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???

• Math -

i have a homework problem:

• Math -

Sierra -- please click Post a New Question and type your problem there.

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