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Elena-2011 [213]
3 years ago
8

Solve -4a² - 1/5b + 1/7cif a = 3, b = -5, c = -21​

Mathematics
1 answer:
frutty [35]3 years ago
8 0

Answer:

Step-by-step explanation:

-4(3)² - 1/5(-5) + 1/7(-21)

-4(9) + 1 - 3

-36 + 1 - 3

-35 - 3 = -38

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The mean of the numbers 5,15,15,7,20,15
agasfer [191]
Answer: 12.83

Explanation:

The mean is the average of a data set. So, in order to find the mean, we have to add all he values and in this case, we got 77. Then we divide 77 by he number of values we have, which results in 12.83. Therefore, the mean of these numbers are 12.83.
4 0
3 years ago
Running from the top of a flagpole to a hook in the ground there is a rope that is 13 meters long. If the hook is 5 meters from
bagirrra123 [75]

Answer:

12 meters

Step-by-step explanation:

Looking at the problem we can see that it typifies a right angled triangle. The rope running from the top of the flagpole to the hook on the ground is the hypotenuse of the triangle. Let us call this hypotenuse c. Let the distance between the hook and the foot of the flagpole be b. Let the height of the flagpole be a.

From Pythagoras theorem;

c^2 = a^2 + b^2

a^2= c^2 - b^2

a= √c^2-b^2

From the question

c= 13 metres

b= 5 metres

a= the unknown

a= √c^2-b^2

a= √(13)^2 - (5)^2

a= √169 - 25

a= √144

a= 12 meters

6 0
3 years ago
Read 2 more answers
Find the distance between the points A and B. If necessary, round to the nearest tenth.
klemol [59]

Answer:

1. 26.2

2. 5.7

3. 5.4

4. 20

Step-by-step explanation:

6 0
2 years ago
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Use the table to find the relationship between the two quantities.
olchik [2.2K]

Answer:

the answer is 3

Step-by-step explanation:

3 0
2 years ago
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Quick algebra 1 question for 50 points!
snow_tiger [21]

Answer:

Yes.

Step-by-step explanation:

Yes, the given line can be used to make reasonable predictions of the number of cheese pizzas that will be sold, since the scatter points clearly show a trend.

As time goes on, the number of pizzas sold is getting bigger, and the trend is what created the line.

The data was taken over 8 consecutive weeks, so we can assume that it can be used in our prediction.

Since the trend has been pretty consistent over periods of time, we can expect it to continue in the upcoming weeks.

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1 year ago
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