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2 years ago

The sum of twice a number and 7 is -19

Mathematics

2 answers:

Neporo4naja [7]2 years ago

8 0

Answer:

The number is:

-13

Step-by-step explanation:

2a+7 = -19

2a = -19 -7

2a = -26

a = -26/2

a = -13

Check:

2*-13 + 7 = -19

-26 + 7 = -19

adoni [48]2 years ago

4 0

Answer:

The number will be -13

Step-by-step explanation:

Let the no. be x

Its twice will be = 2x

According to the question ,

$2x + 7 = -19\\=> 2x = -19 - 7 = -26\\=> x = \frac{- 26}{2} = - 13$

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2 years ago

The value of Peter's house has risen 20% a year for the last 3 years. If the value of Peter's home 3 years ago was $110,000.00,

IRISSAK [1]

Increase $110,000 by 20% 3 times.

110,000 x 0.2 = 22000
(0.2 is 20% as a decimal, we needed to convert it to multiply it)

So we must add 22000 to 110,000, then take 20% of the new cost, and repeat.

Add them
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Take 20% of new value
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Add that
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So the value is now $190,080

A much more efficient way to do this would be multiplying 1.2 instead of 0.2, and skipping the adding part, as you already took 100% of it and are adding 20% more.

Hope this helps!

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3 years ago

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3 years ago

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Pls help me with the answer

Katarina [22]

Answer:

-27

-13

Step-by-step explanation:

-9*3=-27 -*+=-

-25/-5=5 -/-=+

7-(-3)=7+3=10 -(-)=+

-2+-11=-13 -+-=-

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2 years ago

I don't understand what I'm supposed to do here. I have a test on this tomorrow so if you explain how to do it that would be gre

VladimirAG [237]

Here is a little tip for this: The unit above cancels the unit below. So in this problem you are asked to convert pounds to ounce. So your equation will look like this.

ounce = 2.93 pounds $( \frac{16 ounces}{1 pounds} ) = 46.88$
Your ratio should involve the conversion factor. So 16 and 1 is involved canceling A and D. Then, Notice that you started with poubls. Then the ratio must have pounds at the bottom to cancel the units leaving ounces.

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2 years ago