The answer would be -8.4.
Answer:
5.Let Alisha= A
Riley= R
Jordan= J
A=7
R=A+4= 7+4= 11
J=3*7= 21
Riley=11
Jordan=21
6.Red Marbles= 18
Yellow Marbles=18*3=54
Green Marbles=18-10= 8
7.This year= 28 eagles
Last year=28/4 =7 eagles
Difference= 28-7 = 21 Eagles
8.Joel= 8 pictures
Taylor= 8*3= 24 pictures
1 Row= 4 pictures
24 pictures= 24/4= 4 rows
Some textbooks describe direct variation by saying " y varies directly as x ", " y varies proportionally as x ", or " y is directly proportional to x . ") This means that as x increases, y increases and as x decreases, y decreases—and that the ratio between them always stays the same.
E = some event
C = complement of event E
Since the events are complementary, this means P(E)+P(C) = 1
We know that P(E) = 3*P(C) since "an event is three times as likely as its complement"
So we can replace P(E) with 3*P(C) and then isolate P(C)
P(E) + P(C) = 1
3*P(C) + P(C) = 1
4*P(C) = 1
P(C) = 1/4
The probability of the complementary event is 1/4
So the probability of the original event is 3/4 (three times 1/4)
Answer: 3/4
note: in decimal form, 3/4 = 0.75