What type of number is -91i?

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Which two transformations are applied to pentagon abcde to create a'b'c'd'e'? (4 points) translated according to the rule (x, y) ? (x + 8, y + 2) and reflected across the x-axis translated according to the rule (x, y) ? (x + 2, y + 8) and reflected across the y-axis translated according to the rule (x, y) ? (x + 8, y + 2) and reflected across the y-axis translated according to the rule (x, y) ? (x + 2, y + 8) and reflected across the x-axis

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