I think B (Every fifth student from each grade)
A only talks about female students, C talks about students on a sports team which would be biased since the students on the sports team probably get more exercise, and d would be ok but not the best since some last names are more common and others you would get only a very small sample size.
3x-4y=-5
-x+2y=3
Multiply the second by one:
3x-4y=-5
-2x+4y=6
Combine the equations:
x = 1
Substitute x and solve for y:
-2*1+4y=6
-2+4y=6
4y=8
y=2
Answer:
(1,2)
Answer:
C
Step-by-step explanation:
5 1/2 pages in 12 minutes
There are 5 sets of 12 minutes in 1 hour
5 1/2 x 5 = 27 1/2
Therefore she would read 27 1/2 pages in 1 hour
Thats essentially how i did it - sorry if its not a very good explanation.
Answer:
±5
±25
Step-by-step explanation:
(3.49+4.71)1.80=cost
(8.2)1.80=cost
14.76=cost
Luis spends $14.76 all together
