Answer:
x = -9
x = 2
Step-by-step explanation:
Given:
First, note that
Since and stay in the denominator, then
Now add two fractions which stay in the left part. The common denominator is so multiply the numerator of the first fraction by and the numerator of the second fraction by and subtract them in the numerator:
X=16
Really hoped this helped <3
So we are given the mixed fraction 5 and 1/4 and we are asked to subtract 7/8 each time.
We can make 5 and 1/4 into the improper fraction 21/4.
Now that we have this, we want to create a common denominator to make it easier to subtract. We can easily get the common denominator of 8 by multiplying both sides of the fraction by two.
21 * 2/4 * 2 = 42/8.
Our first term is 42/8, as we start out with it.
Now we can subtract to figure out the rest.
Supposing we don’t include 42/8 as the first term, the next terms would be:
35/8, 28/8, 21/8, 14/8.
Notice how we subtract 7/8 each time. As we have a common denominator, we can ignore the 8 on each fraction and focus on the numerator. We simply subtract 7 from 42 each time.
Hope this helps.
Answer:
1. The main objective of the study is to test the claim that the distribution of fatal injuries for cyclists wearing helmets and those without
Null hypothesis: the distribution of fatal injuries for cyclists who do not wear a helmet remains the same distribution for all other cyclists
alternative hypothesis: the distribution of fatal injuries for cyclists who do not wear a helmet does not follow the same distribution for all other cyclists.
for the null hypothesis, the formula for the expected frequency is shown below
E=n*p
E=2075*p
Location of Injury Observed Count Probability p Expected Count
Multiple Locations 1044 0.57. 1182.75
Head 868 0.31. 643.25
Neck 35 0.03. 62.25
Thorax 81 0.06. 124.5
Abdomen/lumbar/ 47 0.03. 62.25
spinem. N=2075
according to the data obtained from the table see graphic 1
P value = 0.0
level of statistical significance Alpha= 0.01
null hypothesis will be rejected if p <0.01
so if we have a p value of 0.0 we can reject the null hypothesis with a significance level of 1%
Correct:
B. Reject Upper H 0. There is sufficient evidence that the distribution of fatal injuries for riders not wearing a helmet does not follow the distribution for all riders.
2. Correct
B. Motorcycle fatalities from head injuries occur more frequently for riders not wearing a helmet.
Ab+2c
=(3)(2) + 2(-4)
=6-8
= -2