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bixtya [17]
3 years ago
8

Solve the system of equations by substitution. Show all work neatly on your work page. Checking your answer is wise. :) Plz need

Mathematics
1 answer:
Flauer [41]3 years ago
7 0

Answer:

x=5

Step-by-step explanation:

3x+2(-3x+11)=7

Use distributive property:

3x-6x+22=7

Combine like terms:

-3x+22=7

-3x=-15

Then divide:

-3x/3=-15/3 = 5

x=5

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vovangra [49]

Answer:2,3 hope it help you

Step-by-step explanation:

4 0
3 years ago
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Find BC.<br> Round to the nearest tenth.<br> C<br> 12<br> A<br> 87°<br> 9<br> B
Dmitrij [34]

Answer:

C-10

A-90

B-10

Step-by-step explanation:

For rounding off to nearest tens, we compare the last digit.

5 0
1 year 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

So

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

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

So

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
Value of expression a (a2 + a +1) + 5 for a = 0 is ___________
jeyben [28]

Answer:

5

Step-by-step explanation:

0(0×2 + 0 + 1) + 5

0(0+0+1)+5

0 + 0 + 0 +5

= 5

8 0
2 years ago
BRAINLY FOR CORRECT ANSWER FOR ALL THREE MATH QUESTIONS &lt;3 thank you &lt;3
MA_775_DIABLO [31]
Question 1

A  

Question 2

D

Question 3

A

Hope this helps i hope you get a 100
8 0
3 years ago
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