Answer:
nothing
Step-by-step explanation:
there was no mistake at all he did it all correct he subtract 11 from both sides the divided by 2 correctly.
Use pythagoras theorem because there’s a right angled triangle
9 because 9⁴ gives you that result, you can try on a calculator ;)
45/15= 3
So 1 minute=3 cents
75*3=225=2.25 converted
75 minutes=$2.25
3.5 cubic centimeters is also equivalent to 3.5 ml
