PLS HELP ASAP. FIRST TO ANSWER CORRECTLY GETS GUARANTEED BRAINLIEST, AND AN EXTRA 100 POINTS.

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?

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.