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ella [17]
3 years ago
11

Appropriate units

Mathematics
2 answers:
mestny [16]3 years ago
6 0

Answer:

$/km would be the right answer

Step-by-step explanation:

I did it on khan academy

Novosadov [1.4K]3 years ago
4 0

Answer:

"$/km"

Step-by-step explanation:

He wants to model "maintenance cost" with respect to "distance"

Normally,

maintenance cost would be in currency --- dollars, pounds etc.

distance would be in kilometers, miles, meters etc.

We need to find the ratio that has the COST on top and DISTANCE on bottom

Looking at the choices,

We can eliminate 1st and 3rd immediately as it doesn't have COST on top.

That leaves us with

$/km

and

km/$

$ is in fact currency and unit for cost and km is in fact unit for distance. We need the ratio that has $ on top and km on bottom, that's the 2nd option.

So, $/km is the appropriate unit.

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simplify the following expression: (x+7/4x) + (5/x-8) I also attached a photo of the problem if you get confused on how I typed
Gnoma [55]

Answer:

\frac{x^{2}  + 19x - 56}{4 {x}^{2}   - 32x}

Step-by-step explanation:

Start by making the denominators of both fraction the same. This can be done by multiplying one fraction's denominator by the other.

After simplifying and combining the two fractions together, check if the numerator can be factorised such that there is a common factor in the denominator and numerator. In this case, the numerator cannot be factorised.

Lastly, expand the denominator.

\frac{x + 7}{4x}  +  \frac{5}{x - 8}

=  \frac{(x + 7)(x - 8)}{4x(x - 8)}  +  \frac{5(4x)}{4x(x - 8)}

=  \frac{x(x) + x( - 8) + 7(x) + 7( - 8) + 20x}{4x(x - 8)}

=  \frac{ {x}^{2} - 8x + 7x - 56 + 20x }{4x(x - 8)}

=  \frac{ {x}^{2}  + 19x - 56}{4x(x - 8)}

=  \frac{ {x}^{2}  + 19x - 56}{4 {x}^{2}  -  32x}

7 0
2 years ago
Jessie works at a car manufacturing plant. One day she installed a total of 46 axles, 2 in each car she worked on. She wants to
shtirl [24]

Answer:

<h2>             23 cars</h2>

Step-by-step explanation:

total number of cars:    x

the total number of axles:    46

and the number of axles  installed per car:   2

2 axles in each car, then total instaled axles:  2•x

2•x = 46

x = 46÷2

x = 23

5 0
3 years ago
Given cos 0 = 4V2/7, find sin 0.<br> sin 0 =<br> V[?]/?
zmey [24]

sin =  \frac{ \sqrt{17} }{7}

8 0
2 years ago
Which equation is a proportion? <br> 1/3= 1/4 <br> 3/4=6/9<br> 5/8=20/32 <br> 7/9=21/28
rosijanka [135]
Well, 1/3 is equal to 0.3, and 1/4 is equal to .25, so it can't be a.
3/4 is equal to .75 and 6/9 is equal to 0.6, so it can't be b.
5/8 is equal to 0.625 and 20/32 is also equal to 0.625, so it could be c.
7/9 is equal to 0.7 and 21/28 is equal to 0.75, so it can't be D.
Your best bet is C. Because both sides of C are equal.
C 5/8=20/32
5 0
3 years ago
. Evaluate the expression below for x = 4. 6(x+8) (please ​
WITCHER [35]

Answer:

D

Step-by-step explanation:

6(x + 8) =                 Plug in x with 4

6(4 + 8) =

6(12) =

72

3 0
2 years ago
Read 2 more answers
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