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Alexxandr [17]
4 years ago
12

Evaluate - 2 + 7+ (-4).

Mathematics
2 answers:
Oksi-84 [34.3K]4 years ago
6 0

Answer:

1

Step-by-step explanation:

You start by adding -2 and 7.

Because the 2 is negative, it's like subtracting from 7.

This is how you get 5 from -2 +7.

Next, you have to add 5 and -4.

It's like subtracting again, so you get 1.

yaroslaw [1]4 years ago
3 0

Answer:

The answer is 5

Step-by-step explanation:

-2 + 7+ = +9

9 +-4=5

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12x60= 720cm
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3 0
2 years ago
Find the constant of proportionality for the table of values.
Anna [14]

The constant of proportionality k is 3.5

Step-by-step explanation:

Proportionality describes any relationship that is always in the same

ratio

If two quantities x and y are in proportionality, then

1. y ∝ x

2. y = k x , where k is the constant of proportionality

∵ x ⇒    6    ,    7      ,    8    ,    9

∵ y ⇒    21   ,   24.5 ,    28  ,    31.5  

∵ y ∝ x

∴ y = k x

- Use x = 6 and y = 21 to find the value of k

∵ x = 6 and y = 21

∴ 21 = k (6)

- Divide both sides by 6

∴ k = 3.5

- Use x = 7 and y = 24.5 to find the value of k

∵ x = 7 and y = 24.5

∴ 24.5 = k (7)

- Divide both sides by 7

∴ k = 3.5

- Use x = 8 and y = 28 to find the value of k

∵ x = 8 and y = 28

∴ 28 = k (8)

- Divide both sides by 8

∴ k = 3.5

- Use x = 9 and y = 31.5 to find the value of k

∵ x = 9 and y = 31.5

∴ 31.5 = k (9)

- Divide both sides by 9

∴ k = 3.5

The constant of proportionality k is 3.5

Learn more:

You can learn more about proportionality in brainly.com/question/10708697

#LearnwithBrainly

4 0
4 years ago
Using the completing-the-square method, rewrite f(x) = x2 - 8x + 3 in vertex form.
Leto [7]

Answer:

B

Step-by-step explanation:

Given

f(x) = x² - 8x + 3

To complete the square

add/subtract ( half the coefficient of the x- term )² to x² - 8x

x² + 2(- 4)x + 16 - 16 + 3

(x - 4)² - 13 ← in vertex form → B

5 0
3 years ago
Traveling to Vietnam,a plane encounters a tailwind and averages 289 mph.However ,on the return trip the plane , now traveling ag
Daniel [21]
2 * plane speed in still air = 289mph + 257mph = 546
plane speed in still air = 273 mph

plane speed in still air + wind speed = 289
273 + wind speed = 289
Therefore, wind speed = 16 mph


5 0
3 years ago
Read 2 more answers
What is the value of sin 0 given that (-6, -8) is a point on the terminal side of 0
butalik [34]
I think the answer to ur question is -3/5
3 0
3 years ago
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