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3 years ago

EASY MATH PLEASE HELP

Mathematics

1 answer:

I am Lyosha [343]3 years ago

3 0

Answer:

C. (2,-4)

Step-by-step explanation:

the reflection of (-2, -4) is (2, -4)

thank you

I hope this helps

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line q passes through points (10, 6) and (1, 2). Line r is perpendicular to q. What is the slope of line r?

Gala2k [10]

Answer:

slope of r = -9/4

slope of Q = 4/9

Step-by-step explanation:

x1 y1 x2 y2

10 6 1 2

(Y2-Y1) (2)-(6)= -4 ΔY -4

(X2-X1) (1)-(10)= -9 ΔX -9

slope= 4/9

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3 years ago

At the auto parts store, Kerna has three things in her basket: wiper blades for $7.49, air fresheners for $3.29, and an oil filt

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Answer:

Find the exact amount

Step-by-step explanation:

If she estimates the amount, it's not accurate enough because it may run a little over $18 when she actually has enough.

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3 years ago

What system of linear inequalities is shown in the graph? Enter your answers in the boxes.

riadik2000 [5.3K]

First, find the equation of the lines:

y=-2x+2 and y=1/3x+2

We see that the shaded part is below the y=1/3x+2 graph, so it becomes y<1/3x+2 (It's not ≤ since it's a dotted line)

For the y=-2x+2, the shaded part is under the line as well, so it becomes y≤-2x+2 (Here, we include the ≤ since it's a solid line)

So your answer is y<1/3x+2 and y≤-2x+2.

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3 years ago

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The midpoint of ab¯¯¯¯¯ is m(−4,1). if the coordinates of a are (−1,3), what are the coordinates of b?

ziro4ka [17]

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3 years ago

.In the Star Wars franchise, Yoda stands at only 66 centimeters tall. Suppose you want to see whether or not hobbits from the Lo

r-ruslan [8.4K]

Answer:

We conclude that the average height of hobbit is taller than Yoda.

Step-by-step explanation:

We are given that in the Star Wars franchise, Yoda stands at only 66 centimetres tall.

From a sample of 7 hobbits, you ﬁnd their mean height $\bar X$ = 80 cm with standard deviation s = 10.8 cm.

Let $\mu$ = average height of hobbit.

So, Null Hypothesis, $H_0$ : $\mu$ $\leq$ 66 cm {means that the average height of hobbit is shorter than or equal to Yoda}

Alternate Hypothesis, $H_A$ : $\mu$ > 66 cm {means that the average height of hobbit is taller than Yoda}

The test statistics that would be used here One-sample t test statistics as we don't know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n}}}$ ~ $t_n_-_1$

where, $\bar X$ = sample mean height = 80 cm

s = sample standard deviation = 10.8 cm

n = sample of hobbits = 7

So, test statistics = $\frac{80-66}{\frac{10.8}{\sqrt{7}}}$ ~ $t_6$

= 3.429

The value of t test statistics is 3.429.

Now, at 0.01 significance level the t table gives critical value of 3.143 for right-tailed test. Since our test statistics is more than the critical value of t as 3.429 > 3.143, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the average height of hobbit is taller than Yoda.

3 0

4 years ago