Four people invested in a restaurant. one person invested $100,000. two others invested in
the ratio x: 2x, and the fourth person invested an amount equal to the other three investors
combined. the total investment was $ 1,100,000.
part a
write an expression for the amount invested by the fourth person.

Me write an equation for the interior angles of this triangle that uses the triangle sum theorem

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point

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?