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3 years ago

Which expression represents a rational number?

Mathematics

2 answers:

vesna_86 [32]3 years ago

6 0

Answer:

Step-by-step explanation:

2/7+sqrt121 is just 2/7+11.

This is rational.

balu736 [363]3 years ago

3 0

Answer:

2/7 + sqrt 121

Step-by-step explanation:

the square root of 121 is a whole number - 11, which is rational and makes the equation rational

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The level of CO2 emissions, f(x), in metric tons, from the town of Fairfax x years after they started recording is shown in the

Temka [501]

1) The average increase in the level of CO2 emissions per year from years 2 to 4 is:
Average=[f(4)-f(2)]/(4-2)=(29,172.15-26,460)/2=2,712.15/2=1,356.075 metric tons. The first is false.

2) The average increase in the level of CO2 emissions per year from years 6 to 8 is:
Average=[f(8)-f(6)]/(8-6)=(35,458.93-32,162.29)/2=3,296.64/2=1,648.32 metric tons. The second is false.

3) The average increase in the level of CO2 emissions per year from years 4 to 6 is:
Average=[f(6)-f(4)]/(6-4)=(32,162.29-29,172.15)/2=2,990.14/2=1,495.07 metric tons. The third is false.

4) The average increase in the level of CO2 emissions per year from years 8 to 10 is:
Average=[f(10)-f(8)]/(10-8)=(39,093.47-35,458.93)/2=3,634.54/2=1,817.27 metric tons. The fourth is true.

Answer: Fourth option: The average increase in the level of CO2 emissions per year from years 8 to 10 is 1,817.27 metric tons.

7 0

3 years ago

If r= 11 units and x = 14 units, then what is the volume of the cylinder

Anastaziya [24]

Answer:

$1694 \pi$

Step-by-step explanation:

I don't see a diagram, so I'm assuming that r is the radius and x is the height of a right circular cylinder (like a soup can).

The volume of the cylinder can be found from the formula

$V=\pi (\text{radius})^2 \cdot (\text{height})$

using the variables in your problem, this is

$V=\pi r^2x$

Plug in the given values for r and x.

$V=\pi(11)^2(14) \\ V=\pi(121)(14) \\ V=1694\pi$

If you need an approximate decimal value for the volume, use a value of pi (ask your teacher how accurate it should be).

Example: Using pi = 3.1416,

$V \approx (1694)(3.1416)=5321.8704$

You might be asked to round that answer, say to 5322 cubic units.

8 0

3 years ago

-2x - y = -9 5x -2y = 18 Solve as a whole number

nexus9112 [7]

Answer:

x = 4, y = 1

(4, 1)

Step-by-step explanation:

-2x - y = -9

5x -2y = 18

-2x - y = -9

+2x +2x

-y = 2x - 9

/-1 /-1

y = -2x + 9

5x -2y = 18

5x - 2(-2x + 9) = 18

5x + 4x - 18 = 18

9x - 18 = 18

+ 18 + 18

9x = 36

/9 /9

x = 4

Now, we solve for y:

-2(4) - y = -9

-8 - y = -9

+ 8 +8

-y = -1

/-1 /-1

y = 1

(x, y) -> (4, 1)

Hope this helps!

6 0

3 years ago

Andrea has $18 to spend. She spent $6.50, including tax, to buy a notebook. She needs to save $5.75, but she wants to buy a snac

dmitriy555 [2]

Answer:

I haven't done these in a really long time so this could be wrong but it's better than nothing I guess.

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

chris buys p pairs of pants and 4 more shirts than pairs of pants. Shirts cost $18 each and pair of pants cost $25 each. What do

jasenka [17]

p is the number of pants

25 is $25 for the pants

18 is $18 for the pants

4 represents that you bought 4 more shirts than pants

plz rate as brainliest answer

6 0

3 years ago