How to write twelve hundredths standard form

Find the x coordinate of the point.

Apackage of orgainc strwberries costs $1.50 while there in season and $2.25 when not in season what the percent increase

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)