Which number is between square root of 21 + 3 / 2

Find the simple interest earned to the nearest cent for each principal,interest rate,and time 735 7% and two and a half years

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?