Product of powers a to the 5th power multiplied by 7a to the 8th power

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1