Answer:
31.5 minutes only
Inverse proportion
Step-by-step explanation:
It takes 45 minutes for Laura to mow the lawn.
For Kelly it takes 1 hour 45 minutes or 60+45 = 105 minutes
In one minute Laura can mow 1/45 of the lawn.
Similarly in one minute Kelly can mow 1/105 of the lawn
Together in one minute they can mow the sum
=
Take lcd for 45 and 105 and make them equivalent fractions with same denominator
LCD of 45 and 105 is 15(3) (7) = 315
In other words it would take 63/2 = 31.5 minutes only to lawn if they work together.
The situation here is the problem on inverse proportion. If no of people increase, work time would decrease.
Answer:
C.I = 0.108 ± 0.022
Step-by-step explanation:
In this case, we are given a symmetric confidence interval, and the sample proportion p', is derived by finding the average of the two values.
Therefore, the sample proportion will be:
= 0.108
p' = 0.108
To find the margin of error, we have:
M.E = ½ * length of confidence interval
Where length of confidence interval = 0.130 - 0.086
= 0.044
Therefore,
Margin of error = 0.022
The confidence interval is expressed as:
p' ± M.E
= 0.108 ± 0.022
Answer:
2x-1 × x+4
<em>sorry if this doesn't help.</em>
Factor out -a
-a(a²+100)
cannot factor further