The area of triangle PQR is 231 cm2 , and PQ = 21 cm. Find the altitude SR. Help me solve this

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl