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i have an idea on how to solve but im not sure
yess.. their are multiple choices
what's your idea?
um............ i honestly have no clue. i need a head start please....
x is the number of students, so x = 9. They're asking for r(p(9)).
ok. sooo 9 = 4x − 3. 9+3=12 divide by 4 i get three. but its not one of the choices..... :/
r(p(9)) means plug 9 into the p(x) equation. Then plug that answer into the r(x) equation. Start by finding p(9) by plugging in 9 for x in p(x).
r(x) is just the amount of money total, not for each student
im lose now..
p(x) = 2x + 1 Substitute 9 for x p(9) = 2(9) + 1
@nerlineg you're not solving for x. You're replacing it with a number
thats 19 @peachpi and that just gives you the amount of pizzas they need to order
9*2+1 = 18+1 = 19
2x +1 determines how many pizzas need to be purchased they need to know how much money needs to be brought in so, wouldnt you put in 9 in the second function ?
p(9) = 19. Now you need to find r(19) so put 19 into r(x)
@nerlineg does it grade it as soon as you put in the answer and hit submit?
no, it doesn't.
i did and i got 4
@peachpi i got 4
@nerlineg please show me how it looks when you change the x in r(x) to 19
how are you doing the math ? 4(19)=76-3=73
oh i plug it in, in the wrong one. but yes i got the same thing @dani_00 got...
just walking you through the steps @peachpi said
so... the answer 73 :)
yep you got it
but this seem tricky. i had a hard time understanding it, but thanks to you two. :)
i have an idea to what to do next time seeing this :)