Find the output, y, when the input, x, is -7

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document