Sam opened a money-market account that pays 4% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $560 in interest. how long did he keep his account open?

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?