Me solve using either elimination or comparison.

ms. audet bought 20 basketballs for a total of $700. if the practice balls cost $30 and the official balls used for games cost $50, how many of each did she buy?

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

What is always true about a positive integer raised to a negative odd power?

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30