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2 years ago

Mr. Li has 16 pencils. He gives 9 pencils top some students. How many pencils does Mr. Li have now?

Mathematics

2 answers:

PIT_PIT [208]2 years ago

5 0

16 - 9 = 7
7 pencils.

Whitepunk [10]2 years ago

5 0

7 pencils

16 - 9 = 7

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How do u do this please

blagie [28]

Answer: In number 1 the answer is 2. Number 2 the answer is 7. Number 3 you read the problem as 4 x 4 x 4 or 4 to the 3rd. For number 4 it's 2x2x2x2x2x2x2 or 2 to the 7th power. Number 5 is right. For number 6 B. is 5. C is 6

Hope this helps

Step-by-step explanation:

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2 years ago

Factor completely<br> -2x^4+6x^3+8x^2

vlada-n [284]

Answer:

-2x²(x + 1)(x - 4)

Step-by-step explanation:

Hello!

Factor:

$-2x^4 + 6x^3 + 8x^2$
$-2x^2(x^2 - 3x - 4)$ Take out GCF

Think: What numbers add up to -3 and multiply to -4?

Answer: -4 and 1

Continue:

$-2x^2(x^2 - 3x - 4)$
$-2x^2(x^2 - 4x + x - 4)$
$-2x^2(x(x - 4) + 1(x - 4))$ Factor by Grouping
$-2x^2(x + 1)(x - 4)$

The complete factored form is -2x²(x + 1)(x - 4)

5 0

1 year ago

Write the sum using summation notation assuming the suggested pattern continues<br> 9-18+36-72

IgorC [24]

I think it is 45 sorry if its wrong

5 0

2 years ago

Read 2 more answers

When solving the equation 12x^2 - 7x = 6-2(x^2 - 1). Evan wrote 12x^2 - 7x = 6 - 2x^2 + 2 as his first step. Which property

hoa [83]

Answer:

d. distributive property

5 0

3 years ago

100 points / please help, im lost

Yakvenalex [24]

Answer:

12:15 is NOT proportional to 3:4

Step-by-step explanation:

7.5:10 is proportional to 3:4 because 3×2.5=7.5, and 4×2.5=10.

39:52 is proportional to 3:4 because 3×13=39, and 4×13=52

45:60 is proportional to 3:4 because 3x15=45, and 4×15=60

12:15 is not proportional to 3:4 because while you can multiply 3x4=12, you can not multiply 4×4 to get 15, you get 16 instead.

8 0

2 years ago

Read 2 more answers