Answer: C
Step-by-step explanation:
Since there are 12 inches in 1 foot,
42 feet converts to 42 x 12 = 504 inches. If he makes a cut starting on one side, he will make 504/20 = 25.2 cuts. Since he won't make a partial cut, the answer is 25
Answer:
14) 21.136505024965 m
15) 43.076759215619 km
Step-by-step explanation:
14)
let h be the height of the lighthouse:
tan(41.3) = 18.7/h
Then
h = 18.7÷tan(41.5)
= 21.136505024965 m
………………………………………
15)
90-71.4 =18.6
Let s be the distance that the plane flew
towards the south:
tan(90 - 71.4) = s/128
Then
tan(18.6) = s/128
Then
s = tan(18.6)×128
= 43.076759215619 km
Answer:
a = 21
Step-by-step explanation:
Step 1: Write equation
6(1/2a - 3) = 1/4(12 + 8a)
Step 2: Solve for <em>a</em>
- Distribute: 3a - 18 = 3 + 2a
- Subtract 2a on both sides: a - 18 = 3
- Add 18 to both sides: a = 21
Answer:
22.51% probability that fewer than 4 of them use their smartphones in meetings or classes.
Step-by-step explanation:
For each adult, there are only two possible outcomes. Either they use their smartphones in meetings or classes, or they do not. The probability of an adult using their phone is independent of other adults. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which is the number of different combinations of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening
47% use them in meetings or classes.
This means that
10 adult smartphone users are randomly selected
This means that
Find the probability that fewer than 4 of them use their smartphones in meetings or classes.
In which
22.51% probability that fewer than 4 of them use their smartphones in meetings or classes.