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4 years ago

Part A: Find a rational number that is between 7.7 and 7.9. Explain why it is rational. (2 points)

1 answer:

7 0

Part A.
7.8 is a rational number between 7.7 and 7.9.
It is rational because it can be written as a fraction of integers, such as 78/10.

Part B.
sqrt(60) = 7.75
sqrt(60) cannot be written as a fraction of integers. It is a decimal number that never ends and never repeats.

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The population of the world was 7.1 billion in 2013, and the observed relative growth rate was 1.1% per year. (a) Estimate how l

Lubov Fominskaja [6]

Answer:

90.91 years

Step-by-step explanation:

If the rate of population of the world was 7.1 billion in 2013, and the observed relative growth rate was 1.1% per year, increase in yearly population = 1.1/100 × 7,100,000,000

= 1.1 × 71,000,000

= 78,100,000

The amount increases by 78.1million every year.

To know how long it will take the population to double.

double of the initial population = 2×7,100,000,000 = 14,200,000,000

Increment per year = 78,100,000

Time it will take for the population to double = 7,100,000,000/78,100,000

= 90.91

≈ 91

This means it will take about 90.91years for the population to double

6 0

4 years ago

Can someone help me real quick? I’ll give brainliest

blsea [12.9K]

Answer:

Number 4 will be Quadrant 3

Number 5 will be Quadrant 1

Number 6 will be 3 -4

Step-by-step explanation:

For number 6 it says a point so that is what I did sorry if i`m wrong

8 0

3 years ago

Read 2 more answers

Find the slope of the line through the pair of points a (2,-3) p(2,9)

Katarina [22]

(x₁,y₁) = (2,-3)
(x₂,y₂) = (2,9)

To determine the slope using two points lie on the line, we could use the following formula
m = $\dfrac{y_{2}-y_{1}}{x_{2}-x_{1}}$

plug in the numbers
m = $\dfrac{9-(-3)}{2-2}$
m = $\dfrac{9+3}{0}$
m = $\dfrac{12}{0}$
m = undefined

The slope is undefined, the line is vertical

6 0

4 years ago

Kate is at a T-shirt sale where she can buy one and get a second one for 30% off. She wants to buy two T-shirts listed at $19 ea

gladu [14]

So in this problem we can state that each T-shirt costs S19 each. And if Kate buys two she gets a 30% off with the second shirt she buys. And how much will she pay?

Solution: 
1. 19 for each t-shirt 
2. Total of $38 if not provided with 30% off
3. 19 x 0.3 = 5.7
4. Hence 30% of $19 is $5.7
5. Next is we deduct $5.7 which is 30% of $19. 
6. 19 – 5.7 = $13.3 
7. Therefore we add one shirt for $19 and the second, less 30% off which now only costs for $13.3. 
8. 19 + 13.3 = 32.3
9. Conclusively, she will pay $32.3 for the shirts.

3 0

4 years ago

Help please! any1 know this

ra1l [238]

Answer:

C, 3

Step-by-step explanation:

By creating a best line of fit you can get the sets of points (16,50) and (12,40)

Using these to find the slope we can get $\frac{40-50}{12-16} =\frac{-10}{-4}$

-10/-4 is 2.5 The best approximation would be C, because if you round it up to the nearest number you would get 3.

3 0

3 years ago