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3 years ago

Jackie followed these steps to evaluate the expression 15-(37+8):3

Mathematics

2 answers:

valkas [14]3 years ago

8 0

The first thing you need to do is in parenthasis. 37+8=45. Now 45-15=30.

Y_Kistochka [10]3 years ago

6 0

The answer would be 30

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What is A decreased by 20% and then increased by 20% of that? Please show your work.

umka21 [38]

$Answer: \\ A - 20\%A = A - 0.2A = 0.8A \\ 0.8A + 20\%0.8A = 0.8A + 0.2 \times 0.8A = 0.8 + 0.16A = 0.96A$

8 0

3 years ago

PLEASE PLEASE PLEASE HELP!!

Marta_Voda [28]

Okay I'll try to show it step by step

Step 1. So first you need to recognise that the diagram is a right angled triangle, with the right angle being at the bottom. This means we can do Pythagoras' Theorem.

Step 2. Now that you know you can use Pythagoras' Theorem, you can apply it. If you don't know, the theorem is a² + b² = c², with, in this case, a being 5 and b being 8. This means we can do 5² + 8² = 25 + 64 = 89.

Step 3. From the previous step, we now know that the length of the side including x is √89, and because we know that part of this side is 3, if we subtract 3 from √89 we get the value of x, so: √89 - 3 = 9.434 - 3 = 6.434, which is your answer.

I hope this helps!

5 0

3 years ago

Solve each equation 3x+2(5x-3)=7

Sloan [31]

Answer:

Step-by-step explanation:

Step 1:

3x + 2 ( 5x - 3 ) = 7

Step 2:

3x + 10x - 6 = 7

Step 3:

13x - 6 = 7

Step 4:

13x = 13

Answer:

x = 1

Hope This Helps :)

7 0

3 years ago

The consumption of a vegetable has decreased. The consumption per capita in 2000 was 22.8 pounds, and in 2010, the consumption

Varvara68 [4.7K]

So... if we take 22.8 to be the 100%, then it dropped to 12.1,
the difference in between being 22.8 - 12.1 or 10.7 decrease

so... what is 10.7 in percentage, of 22.8?
well
$\bf \begin{array}{ccllll}
amount&\%\\
\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\
22.8&100\\
10.7&x
\end{array}\implies \cfrac{22.8}{10.7}=\cfrac{100}{x}$

solve for "x"

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3 years ago

On a 50-question test, a student answered 5 questions incorrectly. What percent did the student answer correctly? A. 45% B. 90%

nadya68 [22]

Hey there,

Pretend that 50 = 100

And that 5 = 10.

I did a 100 test unit test, and I got 10% wrong.

If you think about this, the answer would be 90%

So, it's the same in this case,

50 in half of 100

5 is half of 10.

So . . .

This would mean that your correct answer would be 90% because 5 in this case is to be considered to be 10.

Your correct answer is . . . .

$\boxed{\boxed{90 \ would \ be \ your \ correct \ answer }}$

Hope this helps
~Jurgen

7 0

3 years ago