Answer:
x=2
Step-by-step explanation:
y=2x-1
y=-5x+13
both y has the same value so,
2x-1=-5x+13
7x=14
x=2
You have to solve two equations simultaneously. The equations are:
.40c + .75d =$190
c + d = 300.
Multiply this second equation by -0.4 on both sides leaving you -0.40c -0.40d = 120. Subtract this new equation from the first and solve for d.
0.40c + 0.75d = 190
- 0.40c - 0.40d = 120
-----------------------------
0.35d = 70
Solve for d. 70/0.35d d = 200. Plug this number back into the original equation and c = 100.
I find that Khan Academy is a helpful tool to learn geometry.
Answer:
Probability both are nervous around strangers = 0.0049
Probability at least one is nervous around strangers = 0.1302
Step-by-step explanation:
Let probability a person selected in the population is nervous around strangers = P
P = 7%
P =
P = 0.07
Let probability a person selected in the population is not nervous around strangers = P'
P' = 1 - P
P' = 1 - 0.07
P' = 0.93
(i) probability of the first person selected is nervous around strangers = P
probability of the second person selected is nervous around strangers = P
Probability both are nervous around strangers = (P × P)
= 0.07 × 0.07
= 0.0049
(ii) Probability at least one is nervous around strangers = ( probability the first person is nervous around strangers AND the second person is not nervous around strangers ) OR ( probability the second person is nervous around strangers AND the first person is not nervous around strangers)
This implies,
Probability at least one is nervous around strangers = (P × P') or (P × P')
= (0.07 × 0.93) + (0.07 × 0.93)
= 0.0651 + 0.0651
= 0.1302
The answer is A because You have to start at 4 then you <u>add 3 two times</u>