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3 years ago

Solve the equation. 8x= 72

Mathematics

2 answers:

BigorU [14]3 years ago

6 0

Answer:

X=9

You divide 8 in each side and you will get x=9

Step-by-step explanation:

mars1129 [50]3 years ago

4 0

Answer:

x = 9

Step-by-step explanation:

8x = 72

Divide each side by 8 to isolate x

8x/8 = 72/8

x = 9

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In the expression 2(4x + 6) = 78, what is the number you divide by at the end to get the answer?

Ilya [14]

Answer:

Step-by-step explanation:

first we will just solve the expression 2(4x +6)=78

1. use destributive property with 2(4x + 6)

2*4x=8x

2*6=12

(8x+12)=78

2. now that the expression is simplified down we will subtract 6 by 6 to isolate it

6-6+=0

78-6=72

3. now we can divide 8x by 8 also divide 78 by 8

8x/8=0

78/8= 9.75

4 0

3 years ago

In a random sample of 40 refrigerators, the mean repair cost was $150. Assume the population standard deviation is $15.50. Const

Mama L [17]

Answer: ($143.69, $156.31)

Step-by-step explanation:

Confidence interval to estimate population mean :

$\overline{x}\ \pm z\dfrac{\sigma}{\sqrt{n}}$

, where $\sigma$ = population standard deviation

n= sample size

$\overline{x}=$ Sample mean

z= critical value.

As per given,

n= 40

$\sigma$ = $15.50

$\overline{x}=$ $150

Critical value for 99% confidence level = 2.576

Then, 99% confidence interval for the population mean:

$150\pm(2.576)\dfrac{15.50}{\sqrt{40}}\\\\\Rightarrow\ 150\pm6.31 \ \ (approx)\\\\\Rightarrow(150-6.31,150+6.31)=(143.69,156.31)$

Hence, the required confidence interval : ($143.69, $156.31)

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4 years ago

Bob and Kathy want to save a total of $500,000 for retirement. Using the present value of a periodic deposit formula, how much s

victus00 [196]

The answer is $1,051.17 if I’m not mistaken

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3 years ago

Please answer this question for 15 points and brainliest!

julia-pushkina [17]

Look at the picture.

$A_1=15\cdot6=90\ cm^2\\\\A_2=5\cdot5=25\ cm^2\\\\A_3=5\cdot4=20\ cm^2\\\\A_4=6\cdot8=48\ cm^2\\\\A_5=15\cdot2=30\ cm^2\\\\A_6=2\cdot2=4\ cm^2\\\\A_7=15\cdot8=120\ cm^2\\\\A_8=15\cdot6=90\ cm^2\\\\S.A.=A_1+2A_2+5A_3+2A_4+2A_5+2A_6+A_7+A_8\\\\S.A.=90+2\cdot25+5\cdot20+2\cdot48+2\cdot30+2\cdot4+120+90\\\\\boxed{S.A.=614}\ cm^2$

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