6.87 + 5.38 equals what as a whole number or a decimal

What percent of 18 is 24? and plz explain thx.

Which strategy is used by public health to reduce the incidence of food poisoning?

Which number is located at point a on the number line? a number line is shown from negative 10 to 10 with each interval mark on the number line representing one unit. point a is labeled one interval mark to the right of negative 5.