Ou want to purchase multiple books on sale for $6.30. The sales tax is 5% and you have $20. At most, how many books can you buy? 5
3
4
2

You could buy 3 books

Step-by-step explanation:

because 5% of 20 is -1 dollar making it 19 then 6.30 + 6.30 + 6.30 = 18.90 and then you would only have 10c so you couldnt buy any more books.

answer: i think it is (1,-2)

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!