What is the approximate area of the figure? a. 947.8 square feet b. 194.2 square feet c. 345.0 square feet d. 244.5 square feet

So you do 18 x 8 to get the area of the rectangle bit. (18 x 8 = 144)
Then you can put the two half circles together to make a full circle. Area of a circle is
pi x radius x radius

so the radius would be half of the diameter (8/2 = 4) 
so area would be:
Pi(equal to around 3.14) x 4 x 4 = 50.2 
then you add the areas of the rectangle and circle 
144 + 50.2 = 194.2

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!