- Total timeof Ndiba =1+3=4hours

Let
- Ndibas speed be x
- Willies speed=x+10
Both travelled same distance



Answer:
c. observational study
Step-by-step explanation:
<em>Researchers compare the rates of autism for children who did and did not receive the standard measles-mumps-rubella vaccine, to see if the vaccine might be responsible for autism in some children.</em>
This study design in the above scenario is observational study because the researcher are obviously observing whether the vaccine is affecting the children. Note that Observational study is like experiment which attempts to understand the cause and effect relationships on a subject.
7 hours
Let x represent hours rented
59=17+6x
42=6x
x=7
Answer: 2 + 1 = 3 2 x 1 =2
Step-by-step explanation: + 7 = 7
Answer:
wait plse
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Step-by-step explanation:
i know the answere i am quite busy will answer u later