30÷4=7.5
45÷7.5=6
you will need about 6 gallons of water to fill it.
Multiple 6 with numbers inside paranthesis:
12x - 66 + 15 = 21
add 66 fhen substrack 15 from both sides :
12x = 72 divide both sides with 12:
x = 6
Answer: 82 degrees
Step-by-step explanation: