Answer:
7. Both are all real numbers
8. Domain is all real and range is -2, +∞
9. Domain is -2<x<2 and range is -3<y<3
10. Domain is all reals and range is -1<y<1
11. Is a function
13. Is not a function
14. Is not a function
15. Is not a function
16. Is a function
17. Is not a function
18. Is a function
19. Is not a function
Step-by-step explanation:
Answer:
3195cm^2
Step-by-step explanation:
4 rectangles, 2 trapezoids. Plug in the values to those formulas and you get the answer.
Ni : Zn: Cu = 7:2:9 =7x : 2x : 9x
7x+2x+9x = 3.8
18x=3.8
x=3.8/18=1.9/9≈0.21
Ni: 7x=7*0.21=1.47 ≈1.5 kg
Zn: 2x=2*0.21=0.42≈0.4 kg
Cu: 9x=9*0.21=1.89 ≈1.9 kg
Check 1.5+0.4+1.9 =3.8 True
Look at the picture hopefully it helps at least a little.
<h3>
Answer: Choice A</h3>
Arrow from 0 to -8 (pointing left). Another arrow from -8 to -6 (pointing right)
See diagram below
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Explanation:
Let's think of this in terms of money. Writing -8 means we are 8 dollars in debt. Since -8 is listed first, this means we start at 0 and go 8 units to the left along the number line, to land on -8.
Then we'll go 2 units to the right to land ultimately at -6. This is because of the "-(-2)" portion, which is the same as "+2". Subtracting a negative is the same as adding. The two negatives cancel each other out.
Going back to the money example, if we have a balance of -8 (we're 8 dollars in debt) and taking away 2 IOU notes means we're 6 dollars in debt. Subtracting a negative can be thought of as taking away debt.
Side note: If we had -8-2, then we would go 2 units to the left of -8 to land on -10 instead.