How do you solve 3a/8+69a/8= and simplify it

Find the sum of the following series. round to the nearest hundredth if necessary.

What kinds of numbers make up the set of numbers called the real numbers? give examples when you explain a number type. there are a limited set of types of numbers, but an unlimited number of examples of these numbers.

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?