Three tenths of the 40 students earned an a. what percent of the students earned an a?

12 students got an A

Step-by-step explanation:

If you write 3 tenths as a decimal you get 0.3

then you multiply 40 by 0.3 to get 12

which gets you the answer of 12 students.

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.  

answer: it's upside down and i can't read it

step-by-step explanation: