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3 years ago

Subtract. (−9.6x+7)−(7.3x−9) Enter your answer, in simplified form, in the box.Can somebody help me with this equation?

Mathematics

2 answers:

ZanzabumX [31]3 years ago

8 0

-16.9x + 16 is the correct answer. You have to remove the parentheses, collect the like terms, and then simplify.

Basile [38]3 years ago

5 0

The given expression is $(-9.6x+7)-(7.3x-9)$ .

Remove the parentheses, collect the like terms, and then simplify.

$(-9.6x+7)-(7.3x-9)=(-9.6x-7.3x)+(7+9)\\ (-9.6x+7)-(7.3x-9)=-16.9x+16$ .

So the final simplified form is $-16.9x+16$ .

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3 years ago

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3 years ago

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3 years ago

Daniel rides his bicycle 21km west and then 18km north. How far is he from his starting point?

insens350 [35]

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3 years ago

Each year, all final year students take a mathematics exam. It is hypothesized that the population mean score for this test is 8

drek231 [11]

Answer:

95% Confidence interval: (96.06,103.94)

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 85

Sample mean, $\bar{x}$ = 100

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 11

95% Confidence interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$100 \pm 1.96(\frac{11}{\sqrt{30}} ) = 100 \pm 3.94= (96.06,103.94)$

(96.06,103.94) is the 95% confidence interval for the population mean test score.

8 0

3 years ago