You will have to take 3x common from both terms and your ans should look like this,
3x(9x^2-4)
Answer:
26.25 gallons
Step-by-step explanation:

21000 = 800x
x = 26.25 gallons
Answer:
a. 15/23
b. 13/27
c. 400g
Step-by-step explanation:
a. When the denominators are the same, you can just sum the numerators.
Which becomes, 13+2=15--> 15/23
b. Same, when the denominator is the same, you can just minus the numerators. Which becomes, 25-12=13--> 13/27
c. 1kg=1000g. 1000/5=200✖️2=400