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Digiron [165]
3 years ago
12

Select two fractions equivalent to 21/28. A)42/56 B)3/4 C)3/9 D)3/7

Mathematics
2 answers:
Natali [406]3 years ago
5 0

Answer: B.) 3/4

Step-by-step explanation:

I Got B by dividing 7 by 21 and 28 which is 3 and 4 so B is the correct answer.

aev [14]3 years ago
4 0

Answer:

b 34

Step-by-step explanation:

hope this helps

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A spherical balloon is being inflated at a rate of 3 cubic inches per second. Determine the change in the rate of the radius.How
Novay_Z [31]

Answer:

The rate rate of change of radius is \frac{1}{48\pi} inches per second when the diameter is 12 inches.

The radius is changing more rapidly when the diameter is 12 inches.

Step-by-step explanation:

Consider the provided information.

A spherical balloon is being inflated at a rate of 3 cubic inches per second.

The volume of sphere is V=\frac{4}{3}\pi r^3

Differentiate the above formula with respect to time.

\frac{dV}{dt}=4\pi r^2\frac{dr}{dt}

Substitute the respective values in the above formula,

3=4\pi 6^2\frac{dr}{dt}

\frac{1}{48\pi}=\frac{dr}{dt}

The rate rate of change of radius is \frac{1}{48\pi} inches per second when the diameter is 12 inches.

When d=16

3=4\pi 8^2\frac{dr}{dt}

\frac{3}{256\pi}=\frac{dr}{dt}

Thus, the radius is changing more rapidly when the diameter is 12 inches.

5 0
3 years ago
2. A bank representative studies compound interest, so she can better serve
Kaylis [27]

Answer:

Step-by-step explanation:

Given that a  bank representative studies compound interest, so she can better serve  customers. She analyzes what happens when $2,000 earns interest several  different ways at a rate of 2% for 3 years.

a) the interest if it is computed using simple interest. 12.00

=\frac{2000(3)(12)}{100} \\=720 dollars

b) the interest if it is compounded annually.

=2000(1.12)^3-2000\\= 809.86 dollars

c) the interest if it is compounded semiannually

=2000(1.06)^6 -2000\\= 837.04

d) the interest if it is compounded quarterly.

=2000(1.03)^12 -2000\\= 851.52

e) the interest if it is compounded monthly.

=2000(1.01)^24 -2000\\= 861.54

4 0
3 years ago
2a^2 + -1(2-a)+3b ; a = 5 , b = 0
Andreas93 [3]
The answer is 53
——————————-
8 0
2 years ago
Read 2 more answers
(5 sqr3 i)^2<br> i’m supposed to simplify it but i don’t understand how???
Brilliant_brown [7]

Answer:

-15625

Step-by-step explanation:

Import this equation onto Symbolab and It will show you all the steps for free.

8 0
2 years ago
Plsss answer, don’t need too show any work
Dovator [93]
Hey! The answer is 60 :)
8 0
2 years ago
Read 2 more answers
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