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3 years ago

Which sums are equal to -8 + 17? Select all that apply

Mathematics

2 answers:

Andreas93 [3]3 years ago

8 0

Answer: b and c

Step-by-step explanation:

-8+17= 9

a. -(8+17)= -25

b. 17+(-8)= 9

c. -8+8+9= 9

d. 8+(-17)= -9

e. -8+(-17)= -25

hope this helps!

saw5 [17]3 years ago

6 0

Answer:

B and C

Step-by-step explanation:

A = -25

B = 9

C = 9

D = -9

E = -25

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Mr. Hamilton has 60,000 to invest in a tax-free fund and in a money market fund. The tax-free fund pays 7.5%, and the money mark

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Answer:

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Let the amount he will invest in tax-free be $x while the amount in money market be $y

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Read 2 more answers

In a sample of 100 steel canisters, the mean wall thickness was 8.1 mm with a standard deviation of 0.5 mm. Someone says that th

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Answer:

This statement can be made with a level of confidence of 97.72%.

Step-by-step explanation:

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Mean, μ = 8.1 mm

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Sample size, n = 100

We are given that the distribution of thickness is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling:

$=\dfrac{\sigma}{\sqrt{n}} = \dfrac{0.5}{\sqrt{100}} = 0.05$

P(mean thickness is less than 8.2 mm)

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Calculation the value from standard normal z table, we have,

$P(x < 8.2) =0.9772 = 97.72\%$

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