Answer:
Step-by-step explanation:
First, make both of the denominators into 100.
Then, 3/10 would be 30/100.
Finally, you can add them to get 43/100.
Book. His initial costs are $864. Binding and packing each book cost $.80 The price of the book is $2.How many copies must be sold to break-even
y=0.8x+864
y=2x
Answer: 720 books
Answer:
x=5.4
Step-by-step explanation:
-2.3(x - 1.2) = -9.66
Distribute -2.3
-2.3x + 2.76 = -9.66 (2 negatives make positive)
Subtract the constant (2.76)
-2.3x = -12.42
Divide by coefficient on both sides to get:
x=5.4
----------------------
(Pretty sure)
Answer:
23
Step-by-step explanation:
y+2=-5(x-5)
=-5x+25
subtract 2 from the left side and subtract it from the 25
y=-5x+23
Answer:
Step-by-step explanation:
Let x be the random variable representing the times a fire department takes to arrive at the scene of an emergency. Since the population mean and population standard deviation are known, we would apply the formula,
z = (x - µ)/σ
Where
x = sample mean
µ = population mean
σ = standard deviation
From the information given,
µ = 6 minutes
σ = 1 minute
the probability that fire department arrives at the scene in case of an emergency between 4 minutes and 8 minutes is expressed as
P(4 ≤ x ≤ 8)
For x = 4,
z = (4 - 6)/1 = - 2
Looking at the normal distribution table, the probability corresponding to the z score is 0.023
For x = 8
z = (8 - 6)/1 = 2
Looking at the normal distribution table, the probability corresponding to the z score is 0.98
Therefore,
P(4 ≤ x ≤ 8) = 0.98 - 0.23 = 0.75
The percent of emergencies that the fire department arrive at the scene in between 4 minutes and 8 minutes is
0.75 × 100 = 75%
