Answer:
30 students
Step-by-step explanation:
Since 18 divided by 30 is .6, you convert .6 to 60% by moving the decimals two places to the right. Hope this helps.
(f - g(x) = 2x -2x squared
(sorry didn't know how to do the squared sign )
Let the cost of 1 notebook be x and the cost of 1 binder be y.
4 notebooks and 3 binders would cost 23.5
Therefore, 4x + 3y = 23.5 (1)
7 notebooks and 6 binders would cost 44.5
Therefore, 7x + 6y = 44.5 (2)
Multiply the first equation by 2.
8x + 6y = 47 (3)
(3) - (2) gives
x = 2.5
Substitute the value of x in (1), we get,
4(2.5) + 3y = 23.5
10 + 3y = 23.5
3y = 23.5 - 10
3y = 13.5
y = 13.5/3
y = 4.5
Hence, cost of 5 notebooks and 3 binders is:
5x + 3y = 5(2.5) + 3(4.5)
= 12.5 + 13.5
= 26
Hence, cost of 5 notebooks and 3 binders is $26.
Answer:
q = -15
Step-by-step explanation:
5q = -75
Divide both sides by 5 : q = -15
The first relation is a function, the others no
