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STatiana [176]
3 years ago
8

Solve by the linear combination method (with or without multiplication). x + y = 40 0.08x + 0.03y = 1.7

Mathematics
1 answer:
Neporo4naja [7]3 years ago
4 0
That's also known as the addition method.
   x + y = 40
.08x+.03y=1.7
We need to multiply the top equation by either a -.08 or a -.03 to eliminate one of the variables.  Let's get rid of the y:
-.03(x + y) = -.03(40) which gives us

-.03x - .03y = -1.2
 .08x + .03y = 1.7
When we add those together we are left with .05x = .5 and x = 10.  If we sub that 10 in for x into the first equation (either would have worked but the first one is way easier to work with!) we get 10 + y = 40 and y = 30.  So the solution to the system is (10, 30)
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balandron [24]

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B. 7,596,288 ft³

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volume of cylinder = π * r^2 * h

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6 0
4 years ago
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PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!<br><br> Evaluate.
vesna_86 [32]

Answer:   B) 46

<u>Step-by-step explanation:</u>

We are looking for the sum of terms 2 through 5.  One option is to find each term and then add them up.

a_i=3i+1\\\\a_2=3(2)+1=7\\a_3=3(3)+1=10\\a_4=3(4)+1=13\\a_5=\underline{3(5)+1=16\ }\\.\qquad \quad \text{Total}=\boxed{46}

3 0
3 years ago
You have to answer to other question before answering this one, just in case anyone was confused
Nuetrik [128]
Answer: C

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(7^5/6 - 5^1/3) + 1^1/9
^
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3 0
3 years ago
Please show me how to solve this equation step by step!<br> 1/25(20-t)=4/25t-3/5
rjkz [21]

Remark

Multiply both sides of the equation by 25. Then you have an equation that you have already done probably.

Step One

Multiply both sides of the equation by 25

1 * (20 - t) = 4t - (3/5) * 25    Every part of the equation must be multiplied by 25

(20 - t) = 4t - 75/5                 3*25/5 = 75/5

20 - t = 4t - 15                       Add t to both sides

20 - t + t =4t + t  - 15             Combine like terms

20 = 5t - 15                            Add 15 to both sides

20 + 15 = 5t - 15 + 15             Combine like terms  

35 = 5t                                    Divide by 5

35/5 = 5t/5                             Switch sides

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5 0
3 years ago
DE is a Mid-segment of triangle ABC. How long is DE?
KIM [24]

Answer:

DE = 14

Step-by-step explanation:

Since, DE is a Mid-segment of triangle ABC.

Therefore,

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7x = 21

x = 21/7

x = 3

DE = 5x - 1

DE = 5*3 - 1

DE = 15 - 1

DE = 14

8 0
3 years ago
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