Answer:
$420
Step-by-step explanation:
Given that the students save$20 every week this can be written as;
1 week= $20 saved
For 21 weeks, you perform multiplication
1w=$20
21weeks=?------------perform cross multiplication
21*20=$420
Were the question too answer sorry ?
Answer:
Given n collinear points, 2(n -1) or 2n - 2 rays can be named
Step-by-step explanation:
When we talk of collinear points, we mean points that lie on the same straight line.
For 3 collinear points we can have 4 rays
For 4 collinear points, let’s say ABCD
A B C D
The rays are AB BA BC CB CD and DC making a total of 6
For 5 collinear points,
A B C D E
The rays are;
AB BA BC CB CD DC DE ED which makes a total of 8
For 6 collinear points, we have;
A B C D E F
The rays are;
AB BA BC CB CD DC DE ED FE EF which makes a total of 10
So what pattern do we notice?
3 points 4 rays
4 points 6 rays
5 points 8 rays
6 points 10 rays
7 points 12 rays
So using the pattern
n rays = 2n - 2 rays or simply 2(n - 1) rays
I'm not sure why options a. and d. are the same, but you would simply count the number of times x and m appear, while being multiplied together, and multiply the product of xm by that number. in this case, the number is 7, so you should get 7(xm) or 7xm.
Answer: 0.4512
Step-by-step explanation:
A bit string is sequence of bits (it only contains 0 and 1).
We assume that the 0 and 1 area equally likely to any place.
i.e. P(0)= P(1)= 
The length of bits : n = 10
Let X = Number of getting ones.
Then , 
Binomial distribution formula : 
, where p= probability of getting success in each event and q= probability of getting failure in each event.
Here , 
Then ,The probability that a bit string of length 10 contains exactly 4 or 5 ones.
Hence, the probability that a bit string of length 10 contains exactly 4 or 5 ones is 0.4512.
