How many roots does this function have in common f(x)=x^2-4x-5

Need on this geometry question. explain how you did it.

Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?