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melisa1 [442]
2 years ago
10

(a) 34 is 85% of what number? (b) What is 15% of 80?

Mathematics
2 answers:
lana [24]2 years ago
6 0

Answer:

A. 40.          B.12

Step-by-step explanation:

40/34=.85

80*.15=12

Gennadij [26K]2 years ago
4 0

Answer:

Part A: 40
Part B: 12

Step-by-step explanation:

Given the following question:

Part A:
34 is 85% of what number?
\frac{85\times40}{100} =85\times40=3400\div100=34
85% of 40 is 34.

Part B:
15% of 80
\frac{15\times80}{100} =15\times80=1200\div100=12
15% of 80 is 12.

Hope this helps.

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2 years ago
Find equations of the lines passing through (−2, 3) and having the following characteristics.
elena-s [515]

Answer:

a.y=13/16x+37/8

b.y=3/2x+6

c.y=3/4x+9/2

d.x=-2

Step-by-step explanation:

All lines must pass through (-2,3)

a. The slope must be 13/16;

y=13/16x+b, SInce it must pass through (-2,3), plug in -2 as the x-value and 3 as the y-value

3=13/16(-2)+b, solve for b.

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b, It must be parallel to the line 3x-2y=2; first, find the slope by converting to y=mx+b

3x-2y=2

-2y=-3x+2

y=3/2x-1, Parallel lines have the same slope so a line parallel to 3x-2y=2 and passing through (-2,3) will have a slope of 3/2.

Plug in (-2,3) to find the b-value again.

(3)=3/2(-2)+b

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c. It must have a line perpendicular to 4x+3y=6.  Again like in b, find the slope.

y=-4/3+2, the slope is -4/3.

Now, perpendicular lines have the opposite inverse slopes which means that you add a negative sign and flip the numerator and denominator

-(-3/4), this is just 3/4

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d. The line is paralell to the y-axis.

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3 years ago
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