X−a+5
​
+
2021
x−2a+5
​
=1
a>0

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?