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Mumz [18]
3 years ago
12

A pool gained 10 gallons of water on Friday due to rain. How could the owner of the pool bring the water level back to its previ

ous level? Select all that apply.
A) Let her kids play in the pool and splash out 10 gallons
B) Let 10 gallons of water evaporate
C) increases the amount of water by 10 gallons due to rain
D) add 10 gallons of water with hose
E) drain 10 gallons of water from the pool
F) fill 10 old milk gallons with water and dump them into the pool
Mathematics
2 answers:
Nimfa-mama [501]3 years ago
8 0

Answer:

A) B) E)

Step-by-step explanation:

I had this question on one of my tests and I got it right :)

Nesterboy [21]3 years ago
3 0
The answer would need to involve the reduction of 10 gallons of water from the pool so options A, B and E. Although, using practicality, B would not be feasible as the it would take a Long time for 10 gallons of water to evaporate and it would be more practical to remove the water physically.
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A= [2, 3; 2, 1], B=[3; 5]. Find AB & BA if possible
oksano4ka [1.4K]

Answer:

The value of AB is \left[\begin{array}{ccc}21\\11\end{array}\right] and it's not possible to multiply BA.

Step-by-step explanation:

Consider the provided matrices.

A=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right], B=\left[\begin{array}{ccc}3\\5\end{array}\right]

Two matrices can be multiplied if and only if first matrix has an order m × n and second matrix has an order n × v.

Multiply AB

Matrix A has order 2 × 2  and matrix B has order 2 × 1. So according to rule we can multiply both the matrix as shown:

AB=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right] \left[\begin{array}{ccc}3\\5\end{array}\right]

AB=\left[\begin{array}{ccc}2\times 3+3\times 5\\2\times 3+1\times 5\end{array}\right]

AB=\left[\begin{array}{ccc}6+15\\6+5\end{array}\right]

AB=\left[\begin{array}{ccc}21\\11\end{array}\right]

Hence, the value of AB is \left[\begin{array}{ccc}21\\11\end{array}\right]

Now calculate the value of BA as shown:

Multiply BA

Matrix B has order 2 × 1  and matrix A has order 2 × 2. So according to rule we cannot multiply both the matrix.

We can multiply two matrix if first matrix has an order m × n and second matrix has an order n × v.

That means number of column of first matrix should be equal to the number of rows of second matrix.

Hence, it's not possible to multiply BA.

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