9. C, because subtracting a negative number "changes" the sign to +
10. C, for the same reason. The equation could be rewritten as -4.2+6.9, which equals 2.7
Step-by-step explanation:
6x-2 = 4x-6
2x+4= 0
x= -2
Answer:
length=2.5feet
Step-by-step explanation:
Volume =Base area * height
6/60=(4*length) * 6/6
10=4length
length=10÷4
=2.5feet
Answer:
The answer is y = ±
,
is a function ⇒ 1st answer
Step-by-step explanation:
Let us revise the steps of find the inverse of a function
- Replace f(x) with y
- Replace every x by y and replace y by x
- Solve the equation in Step 2 for y
- Replace y by
∵ 
- Replace f(x) by y
∴ 
- Replace y by x and x by y
∴
- Divide each side by 4
∴ 
- Take
for both sides
∴ ± ![\sqrt[4]{\frac{x}{4}}=y](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B%5Cfrac%7Bx%7D%7B4%7D%7D%3Dy)
- Switch the two sides
∴ y = ±
∵ There is no fourth root for negative number
∴ x ≥ 0
When you test the graph of
by a vertical line, it will cut it just at one in every position, so it is a function. Look to the attached graph for more understand
∴
is a function
The answer is y = ±
,
is a function
There are 400 yards between Ella's house and the mall. A yard has 3 feet