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3 years ago

I need help ASAP!! 13 points

Mathematics

2 answers:

OleMash [197]3 years ago

6 0

Answer:

The correct answer is H

Step-by-step explanation:

1/4 of a wall in 2/3 of an hour is 40 min

so a wall takes 160 min which is 2 hours and 40 min

so 3 walls takes 8 hours

Brums [2.3K]3 years ago

6 0

Answer:

Step-by-step explanation:

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What is the percentage of 13/16

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In the science lab, Will is testing the freezing point of a substance, which should be −24 ∘C. He is changing the temperature at

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Step-by-step explanation:

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3 years ago

A bucket that weighs 5 lb and a rope of negligible weight are used to draw water from a well that is 60 ft deep. The bucket is f

mestny [16]

Answer:

The value is $W= 2640 \ ft \cdot lb$

Step-by-step explanation:

From the question we are told that

The weight of the bucket is $F = 5 lb$

The depth of the well is $x_1 = 60 \ ft$

The weight of the water is $W_w = 42 lb$

The rate at which the bucket with water is pulled is $v = 1.5 \ ft/s$

The rate of the leak is $r = 0.15 lb/s$

Generally the workdone is mathematically represented as

$W = \int\limits^{x_1}_{x_o} {G(x)} \, dx$ ]

Here G(x) is a function defining the weight of the system (water and bucket ) and it is mathematically represented as

$G(x) = F + (W_w- Ix)$

Here I is the rate of water loss in lb/ft mathematically represented as

$I = \frac{r}{v}$

=> $I = \frac{0.15 }{1.5 }$

=> $I = 0.1$

$G(x) = 5 + (42- 0.1x)$

=> $G(x) = 47- 0.1x)$

$W = \int\limits^{60}_{0} {47- 0.1x} \, dx$ ]

=> $W = [47x - \frac{0.1x^2}{2} ]|\left 60} \atop {0}} \right.$

=> $W= [47(60) - 0.05(60)^2]$

=> $W= 2640 \ ft \cdot lb$

7 0

3 years ago

Ifm_2 = 68°, what is the measure of angle 7? 1 2. 3 5 7

Oksana_A [137]

Answer:

∠7=22°

Step-by-step explanation:

∠2 and ∠7 are supplementary angles, meaning they add to 90°.

∠2+∠7=90°

substitute ∠2

68°+∠7=90°

∠7=22°

7 0

3 years ago