3 years ago

Solve the system of equations. y=4x+8 x^2+7x-20

Mathematics

1 answer:

harina [27]3 years ago

3 0

Can this help you our

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An equation is modeled. What value of x makes the equation true? Explain.

nirvana33 [79]

Answer:

B: x=-1

Step-by-step explanation:

5x+6=1

5x+6-6=1-6

simplify

divide by 5 on both sides

x=-1

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2 years ago

What does rotation do to the pre image of o create it’s image?

olga2289 [7]

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A major department store chain is interested in estimating the mean amount its credit card customers spent on their first visit

sergiy2304 [10]

Answer:

95% Confidence interval: (39.43, 61.58)

Step-by-step explanation:

We are given the following in the question:

Sample mean, $\bar{x}$ = $50.50

Sample size, n = 15

Alpha, α = 0.05

Sample standard deviation = 20

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 14 and}~\alpha_{0.05} = \pm 2.1447$

$=50.50 \pm 2.1447(\dfrac{20}{\sqrt{15}} ) \\\\= 50.50 \pm 11.0751 \\= (39.4249,61.5751)\\\approx (39.43, 61.58)$

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3 years ago

What 5/8x + 1/2 (1/4x + 10)?

gregori [183]

Use photo math it’s free in any telephone

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3 years ago

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What is the conjugate of 8-7i?

Natali [406]

Answer:

8 + 7i

Step-by-step explanation:

Change the sign of the imaginary part.

The conjugate of 8 - 7i is 8 + 7i.

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2 years ago