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7 months ago

Describe a way to check the correctness of a subtraction answer.

Mathematics

1 answer:

Tamiku [17]7 months ago

3 0

Step-by-step explanation:

Well in general, we can represent subtraction as: $x-y=z$

"z" represents the difference, and it really just represents x with y taken away. So if we were to "give back" this y value, we should get "x".

This means that: $z+y=x$

So one way to check, is adding the value that's being subtracted (y value) and the difference (z value), this should get you the value that is being subtracted from (x value). If you don't get the original value that's being subtracted from (x-value) then you know the answer you got is wrong.

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What is the remainder of 715 divided by 9

aliina [53]

Answer:

79 R 4 or 79 R 4/9

Step-by-step explanation:

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2 years ago

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In a triangle the length of two sides are 1.9m and 0.7m. What is the length of the third side, if you know that it should be a w

monitta

Answer:

their sum: 2.8m

their difference: 1.2m

the third side's length should be smaller than their sum, larger than their difference

it could be: 1.3-1.4-1.5-1.6-1.7-1.8-1.9-2-2.1-2.2-2.3-2.4-2.5-2.6-2.7 but since it has to be a whole number, 2m is the only eligible answer.

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2 years ago

Marion bought 14 packages of plastic frog and lizard fishing lures. She bought frog lures in packages of 4 and lizard lures in p

tatuchka [14]

Answer:

Marion bought 6 frog lures and 8 lizard fishing lures.

Step-by-step explanation:

Let $f$ represent frog lures and $l$ represent lizard lures.

The total packages Marion bought is

$f+l=14...eqn1$

If she bought frog lures in packages of 4 and lizard lures in packages of 6 for a total of 72 lures, then

$4f+6l=72...eqn2$

We make $f$ the subject in equation 1 and put it into equation 2 to get;

$f=14-l...eqn3$

We put equation 3 into equation 2 to get;

$4(14-l)+6l=72$

$\Righttarrow 2(14-l)+3l=36$

We expand the bracket to get;

$28-2l+3l=36$

$-2l+3l=36-28$

$l=8$

We put $l=8$ into equation 3 to get;

$f=14-8$

$f=6$

Therefore Marion bought 6 frog lures and 8 lizard fishing lures.

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2 years ago

The graph of a line has a slope of 2 and passes through the point (–6, –5). What is the equation of the line in point-slope form

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Answer:

it would be

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if there is a negative number and you are subtracting it turns positive

Step-by-step explanation:

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2 years ago

a skateboard company is putting together boards and wheels to make skateboards. the company has a box of 36 boards. they need 4

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If you multiply 36 by four since there are 4 wheels for skateboard
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2 years ago

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