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3 years ago

Which of the following is a rational number? square root of 22, square root of 23, square root of 24, square root of 25

Mathematics

2 answers:

ololo11 [35]3 years ago

4 0

square root of 25 is the correct answer

pishuonlain [190]3 years ago

4 0

Answer:

$\sqrt{25}$

Step-by-step explanation:

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Half-life of Po-210 is 140 days. If the initial mass of the sample is 5

Anna35 [415]

Answer:

$0.625kg$

Step-by-step explanation:

we are given half-life of PO-210 and the initial mass

we want to figure out the remaining mass after 420 days

in order to solve so we can consider the half-life formula given by

$\displaystyle f(t) = a {0.5}^{t/T}$

where:

f(t) is the remaining quantity of a substance after time t has elapsed.
a is the initial quantity of this substance.
T is the half-life

since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

thus substitute:

$\displaystyle f(420)=5\cdot{0.5}^{420/140}$

reduce fraction:

$\displaystyle f(420)=5\cdot{0.5}^{3}$

By using calculator we acquire:

$\displaystyle f(420)=0.625$

hence, the remaining sample after 420 days is 0.625 kg

4 0

3 years ago

Three salesmen work for the same company, selling the same product. And, although they are all paid on a weekly basis, each sale

GarryVolchara [31]

Answer:B

Step-by-step explanation:

Salesman B has no cap and get commission for everything he sells so how much he could make is over A because he has a cap and C doesn’t get commission.

5 0

3 years ago

An airplane climbs at an angle of 16° with the ground. Find the ground

Tatiana [17]

Answer:

2403.2

Step-by-step explanation:

We get the length of the hypotenuse, and the base angle. To find the length of the base, we use the cosine of 16° since it is equal to the adjacent side length/ hypotenuse side length or cos 16°= x/2500. The isolate x by multiplying both sides by 2500. The cos 16° is around 0.96126, multiplied by 2500 (cos 16°(2500)) = 2403.1

6 0

3 years ago

There are 36 carpenters in a crew. On a certain day, 29 were present. What percent were at work? (Round your answer to the neare

Allushta [10]

Answer:

80.56%

Step-by-step explanation:

divide 36 by 29 and you get 0.8055555555. Change that into a percent to get 80.56%

8 0

4 years ago

I just need to state the property and justify with simplify.

kykrilka [37]

Answer:

Step-by-stnxnep explanation:

4 0

3 years ago