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Natali [406]
3 years ago
8

Step 1: 80z + 2,000 + 40 Step 2: 80z + 2,040 Where did she make a mistake

Mathematics
1 answer:
mihalych1998 [28]3 years ago
7 0
No, she did the right way!!!!!
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How do you write 415 thousandths
Greeley [361]
415 thousandths is written out 0.415
8 0
3 years ago
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The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 90 inches comma and a standard
Debora [2.8K]

Step-by-step answer:

standard deviation (sigma) = 12 inches

mean (mu) = 90 inches.

For 36 years, the standard error of the mean is

e = sigma / sqrt(n) = 12" / sqrt(36) = 2".

Deviation from the mean

= 92.8 -90 = 2.8

Since the standard error of the mean follows the normal distribution, we have

Z=(92.8-90)/2 = 1.4

Looking up the normal distribution tables, or check R, we find

P(Z>1.4) = 1-P(Z<1.4) = 1-0.9192433 = 0.08075666

Answer: P(snowfall>92.8) = 0.0808 (to four decimal places)

3 0
3 years ago
Please help me with 3.2 ​
Lady_Fox [76]

The measure of the angle ∠PQR is 90 degrees

<h3>How to prove that ∠PQR is 90 degrees?</h3>

The equation of the line PQ is given as:

3x - y - 2 = 0

The coordinates of the QR are given as:

(0, -2) and (6, -4)

Make y the subject in 3x - y - 2 = 0

y = 3x - 2

The slope of the above line is

m1 = 3

Next, we calculate the slope (m2) of points Q and R.

So, we have:

m2 = (y2- y1)/(x2 - x1)

This gives

m2 = (-4 + 2)/(6 - 0)

Evaluate

m2 = -1/3

The slopes of perpendicular lines are opposite reciprocals.

m1 = 3 and m2 = -1/3 are opposite reciprocals.

This means the lines PQ and QR are perpendicular lines.

The angle at the point of perpendicularity is 90 degrees

Hence, the measure of the angle ∠PQR is 90 degrees

Read more about linear equations at:

brainly.com/question/15602982

#SPJ1

4 0
2 years ago
Help!! plz help and full explanation plz
Lemur [1.5K]

Answer:

the answer will be 86%

Step-by-step explanation:

first you  (70x30=2100)

20x62=1240

2100-1240=860

and finally

you say 860÷10=86%

4 0
3 years ago
What is the measure of angle b
ArbitrLikvidat [17]

Answer:

(C) 102 degrees

Step-by-step explanation:

All angles in a triangle must add up to 180 degrees. If you know 2 angles, you must know the last one by subtracting the other two from 180. If you subtract 50 and 28, the two known angles in this situation, from 180, you get 102. Therefor, the last angle must be 102 degrees, or choice C.

4 0
3 years ago
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