Answer:
37.5 Gallons will be used after a 15-minute shower.
50 Gallons will be used after a 20-minute shower.
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Answer:

Step-by-step explanation:

: Do cross multiplication

: Multiply the numbers : 4 and 14

Move 3 to right hand side and change it's sign

Subtract 3 from 56

The value of k is 53
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1st question
$23,760-(4000+6000)=$13,760
$13,760 x 4%=$ 550.40
2nd question
$43,300-(2000+2000)= $39,300
$39,300 x 5%= $1,965
Add all the number then multiply by 1,000
Bse is 10
x^m, x is base of exponent