WORTH 69 POINTS
For the polynomial 6xy^2-5x^2y^?+9x^2 to be a trinomial with a degree of 3 after it has been fully simplified, what is the missing exponent of the y in the second term

Choices:
A. 0
B. 1
C. 2
D. 3
Good luck

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

If 25% of y is 30, what is 60% of y?