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?

Question

For what values of p could the expression 100 divided by p-squared -16 not be evaluated. Explain your answer.

Thanks

Answer 1

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???

Answer 2

i have a homework problem:

Answer 3

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