Do all quadrilaterals have 4 right angles ?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

What is mean median mode and range?

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?