How do you write 0.9 as a percentage

90 % because you move the decimal 2 times to the right.

When you want to convert .9 to percentage think of it like 90/100 which is .9. so it's 90℅

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!