40 points need fast(sqrt is a radical) 1.)simplify: sqrt425 sqrt628 sqrt128 2.)add: -2sqrt7+3sqrt7 3.)subtract: -3sqrt12-3sqrt3-3sqrt20 4.)multiply: 3sqrt3(3sqrt8) 3sqrt3(4-3sqrt5)

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?