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3 years ago

Solve for a 4(2a - 1) = -10(a - 5)

Mathematics

2 answers:

mars1129 [50]3 years ago

8 0

Answer:

A = 3

Step-by-step explanation:

8a-4=-10a+50

8a-4+4=-10a+50+4

8a=-10a+54

8a+10a=-10a+54+10a

18a=54

54 / 18 = 3

A = 3

mylen [45]3 years ago

7 0

The answer would be a=3. to put it more clear, multiply the number outside of the parenthesis. so for example 4•2a is 8a, and 4•-1 is -4. since the -4 has no variable, it would just be 8a-4. next, the -10 times a positive a would be -10a. a positive times a negative is negative. next, do -10•-5 which is positive 50. remember, a negative times a negative is positive! after this, take the 8a-4=-10a+50 and add the constant and the variable (-10a) by the 8a. ALWAYS go right to left when subtracting or adding. you should get 18a. so 18a-4=50. take the negative four and add a positive four because you need to make the sides equal, add the four to 50, and you should get 18a=54. lastly, 54/18 is 3! so, A=3

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A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she wishes to be 90% confident, how

Luda [366]

Answer:

The sample size 'n' = 26

Step-by-step explanation:

Explanation:-

Given a researcher wishes to estimate within $5 the average repair cost of for a refrigerator

Given estimate "E" = $5

The estimate within the average is determined by

$E = \frac{Z_{0.10}S.D }{\sqrt{n} }$

Level of significance ∝ = 90 % or 10%

= 0.90 or o.10

Z₀.₁₀ = 1.645

$E = \frac{Z_{0.10}S.D }{\sqrt{n} }$

$5 = \frac{1.645 X15.50 }{\sqrt{n} }$

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Squaring on both sides , we get

n = 26

Conclusion:-

The sample size 'n' = 26

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3 years ago

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netineya [11]

Answer:

No solution.

Step-by-step explanation:

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3 years ago

Read 2 more answers

What check digit is required to make the following UPC valid? 78007305233D

igomit [66]

Answer:

Step-by-step explanation:

UPC (Universal Product Code) is a numeric symbol used in retail products. UPC has two variants, an 11 digit UPC Type A bar code and and 6 digit UPC Type E bar code.

The given UPC code 78007305233 is an 11 digit UPC Type A bar code.

1) From the right to the left, starting with odd position, we need to assign the odd/even position to each digit.

0 E 0 E 0 E 0 E 0 E 0 [0 stands for Odd, E stands for Even]

7 8 0 0 7 3 0 5 2 3 3

2) Summing up all digits in the odd positions and multiplying the result by 3

(7+0+7+0+2+3)*3 = 19 * 3 = 57

3) Summing up all digits in the even positions

8+0+3+5+3 = 19

4) Summing up the results of step three and four

57 + 19 = 76

5) Now, divide the result of the fourth step by 10. The check digit would be the number which adds the remainder to 10. In our case, upon dividing, 76 by 10 we get the remainder 6. The check digit is the result of 10-6 = 4.

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3 years ago

Find c (0) Thank you for helping!

julia-pushkina [17]

Step-by-step explanation:

$c(x) = - 1 \\ \\ \therefore \: c(0) = - 1 \\$

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4 years ago

Calculate the lateral surface area of the rectangular prism:

bekas [8.4K]

Find the area of all six rectangular faces of the prism. (A= l x b)

A1: 3.1 x 5 = 15.5
A2: 7.4 x 3.1 = 22.94
A3: 5 x 7.4 = 37
A4: 3.1 x 7.4 = 22.94
A5: 7.4 x 5 = 37
A6: 3.1 x 5 = 15.5

Add all answers together to get your answer of 150.88 cm^2.
Hope this helps!!

8 0

3 years ago