2x^2-8x-10 in a(x+b)^2+c

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)