Answer:
Step-by-step explanation:
The function is:
f ( x ) = x² - x - 72
This is a quatdratic function. So we can find the zeroes of the function with the formula:
x 1/2 = ( - b +/- √(b² - 4 ac) ) / ( 2a )
And we have: a = 1, b = - 1 and c = - 72
x 1/2 = ( 1 +/- √((-1)² - 4 · 1· ( - 72 )) ) / 2
x 1/2 = ( 1 +/- √( 1 + 288 ) ) / 2
x 1/2 = ( 1 +/- √289 ) / 2
x 1/2 = ( 1 +/- 17 ) / 2
x 1 = ( 1 - 17 ) 2 = - 16 / 2 = - 8
x 2 = ( 1 + 17 ) / 2 = 18 / 2 = 9
Answer: The zeroes are - 8 and 9.
14.99n + 4.99
If we ordered 3 CDS, we need to replace 3 for n.
14.99(3) + 4.99
44.97 + 4.99
49.96
Answer: $49.96
Answer:
11
Step-by-step explanation:
9+9+11+15 is 44 44/4 is 11
Answer:
5 + 2
Step-by-step explanation:
We have to rewrite the given statement in addition form.
The integers have property of:
Negative(-) Negative(-) = Positive(+)
Positive(+) Positive(+) = Positive(+)
Positive(+) Negative(-) = Negative(-)
Negative(-) Positive(+) = Negative(-)
The given statement is:
5-(-2)
Since we have two negative together, it is converted into a positive.
Thus, the given statement can be written in positive form as
5 + 2