Answer:
<em>Mechanic A worked for 5 hours</em> and <em>Mechanic B worked for 15 hours</em>
I hope my answer and explanation helped!
<u>okay to get started you need to make a system of equations:</u>
x= number of hours worked by mechanic A
y= number of hours worked by mechanic B
x + y= 20
95x + 60y= 1375
<u>substitute in an equation:</u>
x + y= 20
y= 20- x
95x + 60(20-x)=1375
<u>Solve for x</u>
95x + 1200 - 60x=1375
35x =175
x= 5
<u>plug in x to solve for y</u>
x + y= 20
5 + y= 20
y=15
<u>Check work</u>
then you're done :D
Given that there is a survey of 100 randomly selected female members of the gym about choosing between "easy weight-lifting machines or the harder free weights".
Report of the survey says that "female members at the gym prefer the weight-lifting machines over the free weights."
Now we have to select from the given statements that correctly evaluate the report.
According to me "The question is biased towards a response of preferring to use weight-lifting machines." because description of word "hard" is used for "free weights" while word "easy" is used for "machines". That may persuade some people to choose the machine.
Since 100 females are randomly selected not specifically so "The sample is not biased."
Hence final answer should have two statements:
1) The question is biased towards a response of preferring to use weight-lifting machines.
2) The sample is not biased.
Answer:
Kinda vague but here...
Step-by-step explanation:
z*(8-4)
z*(4)
4z