Answer:
Your answer would be C)1,350 mm
Step-by-step explanation:
face area = (15 mm)² = 225 mm²
cube area = 6 × face area = 6×225 mm² = 1350 mm²
X=70 because you have to convert the decimals to fractions so that the .35 equals 7/20 and .45 equals 9/20 then simplify the complex fractions on each side so 7/20 over 2X/3 equals 21/40X and the 9/20 over the X-10 equals 9/20(X-10), then cross multiply to get 420 (X-10)= 320X, next you would distribute the 420 through the parenthesis to get 420X-4200=360X, then add 4200 to both sides so 420X on its own then add 360X on both sides so both X's are on the same side then combine like terms and get 60X on the left, then divide both sides by 60 so X is on its own so X=70
If each board is going to be 47 and 1/2 inches long, and there'll be 24 of them, then their total is just their product.
keep in mind that there are 12 inches in 1 foot.
