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2 years ago

Shanell answered al of her answer on her science test she had 90% correct there were 40 questions how many did she get incorrect

Mathematics

1 answer:

Snowcat [4.5K]2 years ago

6 0

Answer:

Step-by-step explanation:

If she got a 90% on her test, and the test was 40 questions long, we need to do a bit of division and multiplication.

We have to divide 40 by 100, as percentages are out of 100.

So now we have 0.4.

Now we multiply this by 90.

36. She got 36 answers correct out of 40, which means she got four wrong.

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kvv77 [185]

Hello there.^••^

−7w+8(w+1)=w−7
w+8=w−7
w+8−w=w−7−w8=−7
8−8=−7−80=−15
No solutions.

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2 years ago

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Suzie bought a sweater at the sale price of $25. the original cost of the sweater was $40. what percent represents the discount

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2 years ago

Solve for u.<br> |5u + 15| = 10

Rudiy27

Answer:

-1 and -5

Step-by-step explanation:

You must account for negative u values (which the abs nullifies).

So $5u+15=10$ and $5u+15=-10$ is what we have to solve for.

As for usual equations, isolate the u variable.

5u + 15 = 10

5u + 15 (-15) = 10 (-15)

5u = -5

$\frac{5u}{5}=\frac{-5}{1}$

u = -1

Now you can do the same operation for the other equation and you should get u = -5.

Let's make sure we did it right by replacing u with one of our solutions (-1 or -5).

$|5(-1)+15| = 10\\10 = 10$

That's true. What about the other one?

$|5(-5)+15|=10\\10=10$

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2 years ago

A cone is 10 inches tall and has a radius of 3 inches. What is the cone’s volume?

monitta

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