Jim and shirley, working together, can rake the yard in 3 hours. working alone, shirley takes three times as long as jim. how long does it take jim to rake the yard alone?

4 hours

Step-by-step explanation:

Let time taken by Jim to rake be x hours

Jim's rate will be 1/x

Let y be time taken by Shirley to rake alone

Shirley's rate is 1/y which is equivalent to 1/3x since Shirley takes three times as long as Jim to imply Shirley's rate is slow

Total rate=1/x+1/3x=4/3x

Combined rate=4/3x which it takes them 3 hours hence a rate of 1/3

Therefore

4/3x=1/3

x=4 hours

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.  

hello i am doing good for you that it's summer in your country or state ; )

btw in my country we just have sun and rain as (because i live in the caribbean lol)

also, thx a lot for the points : )