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3 years ago

For the following system, subtract the second equation from the first equation.

Mathematics

1 answer:

schepotkina [342]3 years ago

5 0

Here we multiply the 2nd eqation with -1 and then add both
and answer is
-6y=12

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A teacher claims that the proportion of students expected to pass an exam is greater than 80%. To test this claim, the teacher a

erica [24]

Answer:

z=-1.591

Step-by-step explanation:

Null Hypotheses,

$H_0 : p=0.8\\H_a: p>0.80$

So we use z-test for one population proportion (right-tailed test)

According to this informaton, we defined that

$\alpha=0.05$

$z_c=1.64$ (critical value)

So our Rejection region is $R={z:z>1.64}$

$z=\frac{\bar{p}-p_0}{\sqrt{p_0(1-p_0)/n}} = \frac{0.755-0.8}{\sqrt{0.8(1-0.8)/200}}=-1.591$

Not rejection.

6 0

3 years ago

55 percent of 48 is the same as 60 percent of what number? I WILL AWARD BRAINLEIST

mars1129 [50]

Answer:

Step-by-step explanation:

55% of 48 = 26.4

0%-------------------------------------60%------------100%

0 26.4

60x1.6~=100

26.4x1.6~=44

...55% of 48 is the same as 60% of 44

5 0

3 years ago

A part of the real number line is shown.

umka2103 [35]

Its R
you can just see in figure as square root of 50 is approximately around 7.07

7 0

3 years ago

A taxi driver makes $24.50 in an hour, but uses $6.75 worth of gas during that time. What will the driver's total earnings for t

sergiy2304 [10]

The answer is $17.75, though usually the taxi company will pay for gas that the driver uses.

6 0

3 years ago

A regular polygon has an interior angle of approximately 158.8°.

Step2247 [10]

Answer:

17 sides

Step-by-step explanation:

<u>Property of regular polygons:</u>

Sum of Interior Angles = (n−2) × 180°, where n is number of sides

158.8×n = (n - 2)×180
180n - 158.8n = 360
21.2n = 360
n = 360/21.2
n = 17

5 0

3 years ago