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Irina18 [472]
3 years ago
11

PLEASE HELP ME ANSWER THIS QUESTION!!!

Mathematics
1 answer:
madreJ [45]3 years ago
4 0

speed is 45 miles per hour. 135/45=3, so the answer is 3hours (A)

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Pumps a, b, and c operate at their respective constant rates. pumps a and b, operating simultaneously, can fill a certain tank i
MrMuchimi
Let a, b, and c be the times each pump will fill the tank when working alone.

Therefore, in 1 hour;

1/a +1/b = 1/(6/5) = 5/6 ---- (1)
1/a+1/c = 1/(3/2) = 2/3 ---- (2)
1/b+1/c = 1/(2) = 1/2 ---- (3)

From equation (1)
1/a = 5/6-1/b

Substituting for 1/a in eqn (2)
5/6-1/b+1/c = 2/3
-1/b +1/c = -1/6 => 1/c = 1/b - 1/6 --- (4)

Using eqn (4) in eqn (3)
1/b+1/b-1/6 = 1/2
2/b-1/6 = 1/2
2/b =1/2+1/6 = 2/3
1/b = 1/3
Then,
1/c = 1/3 - 1/6 = 1/6
1/a = 5/6 - 1/3 = 1/2

This means, in 1 hour and with all the pumps working together, the tank will be filled to;
1/a+1/b+1/c = 1/2+1/3+1/6 = 1 (filled fully).

Therefore, it will take 1 hour to fill the tank when all pumps are working together.
7 0
3 years ago
Can anyone help me on this
aliya0001 [1]

Answer:

-6 and 1

Step-by-step explanation:

If you separate the different powers (^), you have -m^3 - 5m^3 and -m^2 + 2m^2.

-m^3 - 5m^3 = -6m^3

-m^2 + 2m^2 = m^2 or 1m^2

4 0
3 years ago
What is the coefficient in the expression x/3+7
Ber [7]
X/3+7
co-efficient=1/3
how?
x/3 is also the same as x(1/3).
4 0
3 years ago
A triangle ABC has two side lengths of 28 ft. and 24 ft. If angle C is 91°, what's the measurement of angle B
Zina [86]

Answer:

Step-by-step explanation:

Given that in a triangle ABC,  AB = 28, BC = 24 and angle C =91,

We have to find measure of angle B.

Since three measurements are given, we can solve the triangle easily

Use the sine formula for triangles.

\frac{c}{SinC} =\frac{b}{Sin B}=\frac{a}{Sin A}

A = arcsin(\frac{asinC}{c}  )=58.98

Since sum of 3 angles is 180, we calculate B easily

Angle B = 180-(A+C)

= 180-(91+58.98)

=30.02

3 0
3 years ago
A population of 200 animals is decreasing by 4% per year. At this rate, in how many years will the population be less than 170?
djyliett [7]
The population will be less that 170 in 4 years
8 0
3 years ago
Read 2 more answers
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