X+12=26, x being the amount spent by Richard <span />
Answer:
34
Step-by-step explanation:
13-(-21) = 13 + 21 = 34
Answer:
68% of the incomes lie between $36,400 and $38,000.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = $37,200
Standard Deviation, σ = $800
We are given that the distribution of SAT score is a bell shaped distribution that is a normal distribution.
Empirical rule:
- Almost all the data lies within three standard deviation of mean for a normally distributed data.
- About 68% of data lies within one standard deviation of mean.
- About 95% of data lies within two standard deviation of mean.
- About 99.7% of data lies within three standard deviation of mean.
Thus, 68% of data lies within one standard deviation.

Thus, 68% of the incomes lie between $36,400 and $38,000.
The solutions are where the lines cross each other.
The lines only cross each other once so there is 1 real solution.
Answer: 1
Answer:
(3,-2)
Step-by-step explanation:
i actually dont know but thnks for the points BTW