David charges $15 plus $5.50 per hour to mow lawns. ari charges $12 plus $6.25 per hour to mow lawns. in what situations is ari's charge greater than or equal to david's charge?

Find the quotient. 50a2 – 98b2 -5a +7b

Prove that quadrilateral is a rhombus.

Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.