x = number of questions
3y = points for a correct answer
-1x or -x = points for an incorrect answer
Adding up the correct and incorrect points/answers gives us the final score. We can solve to see how many questions were incorrect. (We are told 10 were correct)
3y + (-1x) = 20
3(10) + (-1x) = 20
30 - x = 20
10 = x
x = 10
So she got 10 correct and 10 incorrect, and there were 20 questions in all.
Answer:
9 stamp
Step-by-step explanation:
Answer:
No
Step-by-step explanation:
Each x can have only ONE y as its partner. In this relation, -1 has TWO different partners: in one point (-1,-4) the y is -4 and in another point (-1,2) the y is 2. Not a function.
P^2-8p+7p-56
First I foiled. This meaning that I multiplied the first numbers in each pair of parentheses, then I multiplied the outside numbers, then the inside numbers and finally the last numbers.
p^2-p-56
Second I combined like factors.
This should be your final answer, keep in mind that ^2 means squared.
p^2-p-56
