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AleksAgata [21]
3 years ago
8

Find the correct sum of the polynomials (6x3 − 8x − 5) + (3x3 + 6x + 2).

Mathematics
1 answer:
Advocard [28]3 years ago
3 0

Answer:

9x^3-2x-3

Step-by-step explanation:

The question is

(6x^3-8x-5)+(3x^3+6x+2)\\

collect like terms

(6x^3-8x-5)+(3x^3+6x+2)\\\\\\6x^3+3x^3-8x+6x-5+2\\\\\\9x^3-2x-3

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Marta is solving the equation S = 2Πrh + 2Πr2 for h. What is the result?
yulyashka [42]
<span>S = 2Πrh + 2Πr2
Manipulating the equation for h.
Step 1. subtract </span><span>2Πr2 on both sides.

</span>S - 2Πr2 = 2Πrh + 2Πr2 - 2Πr2
S - 2Πr2 = <span>2Πrh
</span>
Step 2 . divide <span>2Πr on both sides
</span>
(S - 2Πr2)/2Πr = 2Πrh/<span>2Πr

</span><span>h = </span>(S - 2Πr2)/2Πr
6 0
3 years ago
The time it takes Natalie to replace x cell phone screens is given by the equation t =
Alexxx [7]

Answer: 25 hours

Step-by-step explanation:

t=1+3x

8 screens

or

x = 8

Replace;

t=1+3(8)

t=1+24

t=25h

6 0
2 years ago
A student concludes that for all values of x,x^2+x+1 produces a prime number. Which value of x serves as counterexample to prove
Dafna11 [192]

Answer:

j

Step-by-step explanation:

Substitute the given values into x² + x + 1 and check if result is prime

x = - 4

(- 4)² - 4 + 1 = 16 - 4 + 1 = 13 ← prime

(- 2)² - 2 + 1 = 4 - 2 + 1 = 3 ← prime

(- 3)² - 3 + 1 = 9 - 3 + 1 = 7 ← prime

4² + 4 + 1 = 16 + 4 + 1 = 21 ← not prime

x = 4 serves as a counterexample to disprove this conclusion

5 0
2 years ago
Please answer this question! 30 points and brainliest!
Darya [45]

That you and her have a 50% chance of winning.

3 0
3 years ago
What is Esthers error
MAXImum [283]

Answer:

Esther didn't divide the area of the faces by 2.

The correct surface area is 72 cm^2

Step-by-step explanation:

Esther didn't divide the area of the faces by 2.

The correct surface area is:

(4 * 4) + 4((4 * 7)/2)

16 + 4(28/2)

16 + 4(14)

16 + 56 = 72 cm^2

6 0
3 years ago
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