The answer is a if the line is dotted/dashed. The answer is c if the line isn't dotted/dashed.
40/3. You mutiply top and bottom straight across, then simplify.
After Greg makes the pudding 1 time, it takes him

hours to make it.
After Greg makes the pudding 2 times, it takes him

hours to make it
After Greg makes the pudding 2 times, it takes him

hours to make it
so The function is

Answer: f of x equals 2 multiplied by 0.8 to the power of x
0.4335/1 x 10000/10000
=4335/10000
=867/2000
When multiplying fractions just multiply the numerator and denominators together, then simplify the fraction you get.
To solve the addition problem, first convert 2 and 1/2 to an improper fraction. It should be 5/2. Now 3/8 and 5/2 must be added together.
To add these, they must have the same denominator. Let's give 5/2 a denominator of 8, so it matches 3/8.
To give 5/2 a denominator of 8, you are starting with a denominator of 2. 2 × 4 = 8, so you must multiply 5/2 by 4.
You should get 20/8. Now you have to add 20/8 and 3/8. The only thing you add is the numerator, so you should get 23/8 as a final answer.
For the subtraction problem, do these same steps to make the fractions you must subtract have the same denominator, then subtract only the numerator to get the answer. Once you solve the subtraction problem, text me what you got so I can check it for you. :)