Log7 (x+2) = log7(x-4)=1

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

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?