For 18 I think it’s (-4,8). but it was sort of blurry in the picture, but if this is right I hope it helped!
Answer:
y = (12-2x)/3
Step-by-step explanation:
Isolate the variable by subtracting -2x and dividing by 3
Umm I'm not sure. Put it in a calculator?
Answer:
x = 4
Step-by-step explanation:
Eliminate y by setting the first equation equal to the second:
2x - 7 = -x + 5
Combining like terms, we get:
3x = 12, so that x must be 4.
Answer:
The test statistic for this test is: z = -2.60, option b.
Step-by-step explanation:
The test statistic is:
In which X is the sample mean, is the value tested at the null hypothesis, is the standard deviation and n is the size of the sample.
H0: p = 0.50 vs HA : p≠0.50
This means that
A random sample of 900 13- to 17-year-olds found that 411 had a computer in their room with Internet access.
This means that
Value of the test-statistic:
The test statistic for this test is: z = -2.60, option b(should be).