The best first step
for the elimination method would be: <span>1. multiply the first equation by 2 and the second equation by 3.
</span><span>
2x - 6y = 2 /*2
5x + 4y = 28 /*3
____________
4x - 12y = 4
15x + 12y = 84
____________
4x - 12y + 15x + 12y = 4 + 84
19x = 88
x = 88/19
</span>
I think the ratio of a vertical change to the horizontal change is called slope.
Answer:
The probability that 44% or fewer of the pre-teens have a TV in their bedroom is 96.64%.
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean and standard deviation , the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
For a proportion p in a sample of size n, we have that
In this problem:
The probability that 44% or fewer of the pre-teens have a TV in their bedroom is
This is the pvalue of Z when X = 0.44. So
has a pvalue of 0.9664
The probability that 44% or fewer of the pre-teens have a TV in their bedroom is 96.64%.
Answer:
159=15+9x x=16
Step-by-step explanation:
it will take Fernando 16 weeks to save up enough money