When the bases are the same, you can combine the exponents.
x³ [x is where the base is]
For example:
x³ · y² = x³y² You can't simplify this anymore because they have different bases/variables
[when you multiply a variable with an exponent by a variable with an exponent, you add the exponents together] so:
x² · x³ = 
[when you multiply a variable with an exponent by an exponent, you multiply the exponents together] so:
(x³)²=

Then there would be 9 girls and 23 boys
75 is the median
And 79 is the mode