Answer:
Step-by-step explanation:
Hello,
You can list the following ones which are correct for a), b) and c)

Thanks
Answer:
-1
Step-by-step explanation:
Hello,
Please, see the attached file.
Thanks.
Answer: 5
hrs
<u>Explanation:</u>
Jasper:
per hr
Yolanda:
per hr
Together:
per hr
Jasper + Yolanda = Together
+
= 
+
= 
3x + 21 = 7x
21 = 4x
= x
