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NNADVOKAT [17]
3 years ago
15

13 subtracted from a number w is 15.

Mathematics
2 answers:
yarga [219]3 years ago
7 0
W-13=15|+13
w=15+13
x=28

<em>Answer: w=28</em>
zloy xaker [14]3 years ago
5 0
W is 15 when 13 has been subtracted from it? So, you need to add back what was subtracted giving you 28. I think that's what you were asking, you weren't all too clear. Hope I helped.
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A heavy rope, 50 ft long, weighs 0.6 lb/ft and hangs over the edge of a building 120 ft high. Approximate the required work by a
Anastasy [175]

Answer:

Exercise (a)

The work done in pulling the rope to the top of the building is 750 lb·ft

Exercise (b)

The work done in pulling half the rope to the top of the building is 562.5 lb·ft

Step-by-step explanation:

Exercise (a)

The given parameters of the rope are;

The length of the rope = 50 ft.

The weight of the rope = 0.6 lb/ft.

The height of the building = 120 ft.

We have;

The work done in pulling a piece of the upper portion, ΔW₁ is given as follows;

ΔW₁ = 0.6Δx·x

The work done for the second half, ΔW₂, is given as follows;

ΔW₂ = 0.6Δx·x + 25×0.6 × 25 =  0.6Δx·x + 375

The total work done, W = W₁ + W₂ = 0.6Δx·x + 0.6Δx·x + 375

∴ We have;

W = 2 \times \int\limits^{25}_0 {0.6 \cdot x} \, dx + 375= 2 \times \left[0.6 \cdot \dfrac{x^2}{2} \right]^{25}_0 + 375 = 750

The work done in pulling the rope to the top of the building, W = 750 lb·ft

Exercise (b)

The work done in pulling half the rope is given by W₂ as follows;

W_2 =  \int\limits^{25}_0 {0.6 \cdot x} \, dx + 375= \left[0.6 \cdot \dfrac{x^2}{2} \right]^{25}_0 + 375 = 562.5

The work done in pulling half the rope, W₂ = 562.5 lb·ft

6 0
2 years ago
What are the two ratios that are equivalent to 2:9
weeeeeb [17]

Answer:

bc

Step-by-step explanation:

2:9 is equivalent to

18: 81 because is 2*9 : 9*9

12:54 because is 2*6 : 9* 6

8 0
3 years ago
PLZ HELP 20 POINTS AND CHOOSING BRAINLIEST
kow [346]
The answer is C (301.6)
8 0
3 years ago
Find the value of c and YZ if Y is between X and Z.<br><br><br><br> XY=5.5, YZ=2c, XZ=8.9
andrey2020 [161]

Answer:

XZ = XY+ YZ

8.9=5.5+2c

2c= 8.9-5.5

2c=3.4

c=1.7

YZ =  2c=3.4

Step-by-step explanation:

6 0
3 years ago
Find the length of BC.<br>A) 8 <br>B) 12 <br>C) 16 <br>D) 18
kvasek [131]

I think its 12.

I could be wrong. Let me know.

-Steel jelly


8 0
3 years ago
Read 2 more answers
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