A rectangle has a length of (x+3) feet and a width of 1/2x feet. If the perimeter is 21 feet, what is the length of the rectangle?

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?