Answer:
- 5x² + 6x + 6
Step-by-step explanation:
f(x) - g(x) - h(x)
= 3x + 5 - (4x² - 2) - (x² - 3x + 1) ← distribute parenthesis
= 3x + 5 - 4x² + 2 - x² + 3x - 1 ← collect like terms
= - 5x² + 6x + 6 ← in standard form
Answer:
M
Step-by-step explanation:
M
M
M
M
M
I
L
K
Its a simultaneous equation:
lets make "x" the used games and "y" the new ones
4x + 2y = 84
6x + y = 78. (multiply this by 2 to cancel out y)
12x + 2y = 156
so now we subtract them:
12x - 4x = 156 - 84
x = 9
used games cost $9
new games cost 78 - 6(9) = $24
Janet has $120 but she already bought 3 NEW games so:
120 - 3(24) = $48 left
48/9 = how many used ones she can buy = 5. something
she can buy 5 used
We have been given that the standard deviation of a group of 20 scores is 15 and we are asked to find variance.
Since we know variance is square of standard deviation. In order to find out the variance of the given data we have to take the square of 15.
Therefore, our variance is 225.
