Simplify the expression: Ava simplified the expression and said that the value is -1. Is Ava's solution correct? If not, find and explain her mistake. Give the correct solution.

Ava's solution was not correct.

The correct solution is 1.

Step-by-step explanation:

The expression Ava was to simplify(as seen in the attachment) is:

On substitution of the result above into the denominator, we have:

Therefore:

Ava did not take the square of the negative sign. This led her to have a negative result.

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!