If δabc δdec, what is m∠d? a. 40° b. 150° c. 60° d. 80°

I think that the best answer here would be that A = 40 degrees. 

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.