3 years ago

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Mathematics

1 answer:

Elanso [62]3 years ago

3 0

Answer:

D. 7

Step-by-step explanation:

substitute -1 everywhere there is an x

5-2(-1) multiply

5-(-2) add

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the line below contains X,Y,and Z, in that order. The ratio of the length of XY to the length of YZ is 5:9. If it can be determi

maw [93]

Answer:

$\dfrac{XY}{XZ} =\dfrac{5}{14}$

Step-by-step explanation:

We are give the following in the question:

$\dfrac{XY}{YZ} = \dfrac{5}{9}$

We have to find the ration of the length of XY to the length XZ.

This, can be done as:

$\dfrac{XY}{XZ} = \dfrac{XY}{XY+YZ}\\\\\Rightarrow \dfrac{XZ}{XY} = \dfrac{XY+YZ}{XY} = 1 + \dfrac{YZ}{XY}\\\\\Rightarrow \dfrac{XZ}{XY} = 1+\dfrac{9}{5} = \dfrac{14}{5}\\\\\Rightarrow \dfrac{XY}{XZ} =\dfrac{5}{14}$

Thus, the ration XY:XZ is 5:14

8 0

3 years ago

Jim weighs 30 pounds less than Tom, and together they weigh 210 pounds. Let n = Tom's weight in pounds. How much does Tom weigh?

never [62]

First, let's write an equation for the situation.

Jim's weight is 30 pounds less than Tom's, so his weight is:

n - 30

If Tom's and Jim's weights add to 210:

n + (n - 30) = 210

Solve for n:

2n - 30 = 210

2n = 240

n = 120

Tom weighs 120 pounds.

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3 years ago

1 Sam can make $5.75 an hour working at

boyakko [2]

Answer:

Step-by-step explanation:

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3 years ago

Read 2 more answers

A chemist needs a 30% iron alloy. How many grams of a 70% iron alloy must be mixed with 16 grams of a 20% iron alloy to obtain t

Alex787 [66]

Let x=grams of 70% alloy:
0.70x+16×0.20=0.30(x+16)
0.70x=0.30x+4.8-3.2
0.40x=1.6
x=1.6/0.4=16/4=4g
4 grams of 70% alloy are needed.