(7.8 × 10^3) × (1.0 × 10^4)
In scientific notation

Polar coordinates is 8,9

Is there a picture?

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.

2x+10=36. x being the number of friends.