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just olya [345]
3 years ago
9

-3(-4r - 5) combining like terms

Mathematics
2 answers:
vagabundo [1.1K]3 years ago
6 0

Answer:

12r + 15

Step-by-step explanation:

Just distribute

svp [43]3 years ago
3 0

Answer:

r

=

1

Step-by-step explanation:

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There are exactly four positive integers $n$ such that \[\frac{(n + 1)^2}{n + 23}\] is an integer. Compute the largest such $n$.
ololo11 [35]
Let's present the given equation first. Deciphering the given code, I think the equation is (n+1)²/n+23. Then, we want to find the maximum value of n. Suppose the complete equation is:

f(n) = (n+1)²/n+23

To find the maximum,let's apply the concepts in calculus. The maxima can be determined by setting the first derivative to zero. Therefore, we use the chain rule to differentiate the fraction. For a fraction u/v, the derivative is equal to (vdu-udv)/v². 

f'(n) = [(n+23)(2)(n+1)-(n+1)²(1)]/(n+23)² = 0
[(n+23)(2n+2) - (n+1)²]/(n+23)² = 0
(2n²+2n+46n+46-n²-2n-1)/(n+23)²=0
n²+46n+45=0
n = -1, -45

There are two roots for the quadratic equation. Comparing the two, the larger one is -1. Thus, the maximum value of n is -1.
5 0
3 years ago
Elizabeth works part-time to help pay for college. She has worked for the last 14 days without a day off for a total of 48 hours
Zinaida [17]
The answer if I am correct should be C. 6, since if you divide forty-eight by two you get twenty-four. Twenty-four divided by four equals six, and twenty-four divided by three equals eight, eight is the number that would be the remaining amount of days. Hope this helps you and have an amazing day!
3 0
3 years ago
Read 2 more answers
What would be the answer to this?
Eddi Din [679]

Answer:

If you are looking for x it equals 80 degrees

Step-by-step explanation:

vertical angles are congruent

7 0
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I just need help with part B and C
inysia [295]

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The photo is too blurry on my computer.Can you type the equation.

Step-by-step explanation:

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4 years ago
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1850 x 0.22 (decimal form of 22%) = 407. 407 plastic beads are on clearance.
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3 years ago
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