Describe how to write 3 digit numbers in three different ways

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Read the equations in the table below. then drag a description of the situation and a table to represent each equation. indicate whether each of the relationships is proportional or non-proportional.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.