Answer:
68 texts per day
Step-by-step explanation:
The description of the variables in the equation tells you that you want to find t (texts sent per day) for the given value of 'a' (age in years).
__
Substitute the number (15) for the variable (a) and do the arithmetic:
t = -1.63a +92.14
t = -1.63(15) +92.14 = -24.45 +92.14
t = 67.69
Keiko's trend line estimates a 15-year-old would send about 68 texts per day.
Answer: 61.2?
Step-by-step explanation:
Answer:
m = (f(4) - f(2)) / (4 - 2)
m = (24 - 10) / (4 - 2)
m = 14 / 2
m = 7
Answer:
Step-by-step explanation:
So we want to make x the subject of the formula:
First, distribute the left side:
Combine all the terms with x with it on one side. To do this, first subtract bx from both sides. The right side cancels:
Remove the -ab from the left. Add ab to both sides. The left side cancels:
Now, distribute out the x from the left side:
Divide both sides by (a-b). The left side cancels:
Therefore:
Answer:
16%
Step-by-step explanation:
First we start by solving for the z score
We have the following information
x = 3.25
Standard deviation = sd = 2.25
Mean = 5.50
Z = (x - mean)/sd
z = 3.25 - 5.50/2 25
z = -1.00
If we look this up in the standard normal distribution table,
P(z<-1.00) = 0.1587
Which when approximated gives us
16%
Therefore approximately 16% of lobsters will have to be returned back to the sea.
