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Eva8 [605]
3 years ago
8

A triangle is graphed in the coordinate plane. The vertices of the triangle have coordinates (-4, 1), (1, 1), and (1, -11). What

is the perimeter of the triangle? A.) 30 B.) 25 C).18 D.) 17
Mathematics
1 answer:
Jlenok [28]3 years ago
3 0
The answer is 30. hope it will help you.
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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
The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of 0.5 min
Hitman42 [59]
Given:
μ = 2 min, population mean
σ = 0.5 min, population standard deviation

We want to find P(x>3).

Calculate the z-score
 z= (x-μ)/σ = (3-2)/0.5 = 2

From standard tables, obtain
P(x ≤ 3) = P(z ≤ 2) = 0.9772
Therefore
P(x > 3) = P(z > 2) = 1 - 0.9772 = 0.0228

Answer: 0.02275
8 0
3 years ago
there are 750 people at a football game. Out of this number, 320 are students.  What percent of the people at the football game
Norma-Jean [14]
To do this problem you use is/of=percent/100
So:
320/750=x/100
cross multiply 
32,000=750x
divide both sides by 750
x=42.66 repeating

ANSWER: X=42.66 REPEATING
3 0
2 years ago
Read 2 more answers
My quiz had 15 questions, I got a score of 67.8%. how many questions did I get wrong?
Ne4ueva [31]
You take 67.8/100×15
10.17
then take 15-10.17 the answer will be the wrongs u got
=4.83
4 0
3 years ago
Read 2 more answers
What is the perpendicular distance from the line y= 2x-3 to the point (8,3)
Liula [17]
Find the perpendicular line then find the intersection then find the point

perpendicular lines have slopes that are perpendicular
the slopes multiply bo -1

y=mx+b
m=slope
y=2x-3
2 is slope

2 times what=-1
what=-1/2


the equation is
y-3=-1/2(x-8) or
y=(-1/2)x+7

find intersection
at (4,5)
distance bwetweeen (8,3) and (4,5)
D=\sqrt{(8-4)^2+(3-5)^2}
D=\sqrt{(4)^2+(-2)^2}
D=\sqrt{16+4}
D=\sqrt{20}
D=2√5
distance= 2√5
7 0
3 years ago
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