Answer:
2. "two thirds of the fourth power of <em>r</em>"
4. n + 14
6. 7 +11n
8. (2/5)n^2
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7. 28
8. 1/5
Step-by-step explanation:
2. "two thirds of the fourth power of <em>r</em>"
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4. "sum" means the listed items are added. You can use any convenient variable to represent "a number." I often use <em>n</em> for <em>n</em><em>umber</em>.
n + 14
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6. "7 more than" means 7 is added to whatever follows. "11 times a number" means the number is multiplied by 11.
7 + 11n
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8. "of" means "times". The square of a number is that number to the power of 2.
(2/5)n^2
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7 & 8 (evaluation). Your calculator can do this. (If not, get one that can.) Note that parentheses are needed around numerators and denominators and anything else that must be treated as a single value.
5. Answer: (-3, 2)
<u>Step-by-step explanation:</u>
In order to use the substitution method, you need to solve for one of the variables.
2x + 4y = 2
x + y = -1 → y = -x - 1
2x + 4(-x - 1) = 2
2x - 4x - 4 = 2
-2x - 4 = 2
-2x = 6
x = -3
y = -x - 1
= -(-3) - 1
= 3 - 1
= 2
Check:
2x + 4y = 2
2(-3) + 4(2) = 2
-6 + 8 = 2
2 = 2
Yep, b is correct
6/15=x/20
15x=6(20)
15x=120
15x/15=120/15
x=8
Answer:
D $9.56
Step-by-step explanation:
13 * .7 * 1.05 = 9.555
$9.56
45% off....means u r paying 55%
55% of 40 = 0.55(40) = $ 22 <== sale price