Answer:
B
Step-by-step explanation:
Out of the 4 options, we only need 1. Therefore, the probability is
Lisa takes 3 hours to mow the lawn, while her cousin, Barb, takes 2 hours. How long will it take them working together?
2 answers:
Answer:
t=72 minutes
Step-by-step explanation:
If it takes Lisa 3 hours to mow the lawn, then she mows 13 of the lawn per hour. Barb takes 2 hours to do it alone so she completes 12 of the lawn each hour. Working together, they mow the lawn in some time t. This can be written as
+
=
Multiply each side by the least common denominator, 6t.
6t(+
)=6t(
)
Simplify and solve.
2t+3t=6
We can multiply the fraction by 60 to convert the fraction of an hour to minutes.
t= (60 minutes)
To mow the lawn, it takes the two working together
t=72 minutes.
You might be interested in
The figure below shows the standard normal distribution or "bell-shaped" curve, plotted against the z-score.
The z-score is defined as
z = (x - μ)/σ
where
x = nrandom variable
μ = mean
σ = standard deviation.
As z-values decrease, areas to the left of z decrease as shown by the shaded area.
Answer:
Areas to the left of z decrease.
The z-score is defined as
z = (x - μ)/σ
where
x = nrandom variable
μ = mean
σ = standard deviation.
As z-values decrease, areas to the left of z decrease as shown by the shaded area.
Answer:
Areas to the left of z decrease.