Answer:
T=90 G=30
Step-by-step explanation:
T=3G
20T+15G=2250
20(3G)+15G=2250
60G+15G=2250
75G=2250
Divide by 75
G=30
T=90 3(30)
Answer:
To use a paired t-test
Step-by-step explanation:
t-tests are essentially tests carried out to compare two different groups to check if there is a major difference in their performances or results which may be related in certain characteristics.
A paired (correlated) t-test is used when there are matched pair of similar units or instances of repeated measurements.
In this case, Mary has to use a paired t-test because the samples (students) have high similarity in characteristics. The students in question has to be from the same class to test her hypothesis (similar characteristics).
Answer:
z=-1
Step-by-step explanation:
8z+7=-15
8z=-15+7
z=-8/8
z=-1
Answer:
$12.37
Step-by-step explanation:
$ (11.62 + 0.75)
= $12.37
Hope this helped!
<h3>
Explanation:</h3>
Q1: The solution of a system of two linear equations in two variables is the point where their graphs intersect. At that point, the (x, y) pair satisfies both equations.
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Q2: There will be no solution when the lines representing the equations do not intersect. That will only happen when they are parallel. (We say the equations are "inconsistent.")
There will be infinitely many solutions when the lines overlap. That is, the equations for them are essentially the same equation. (We say the equations are "dependent.")
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Q3: Elimination is easiest when the coefficients of one of the variables are opposites of each other, or if one is a factor of the other. Substitution is easiest if one of the equations is easily put in the form x = ( ) or y = ( ).
If neither or both conditions hold, the choice is by student preference. (In this latter case, solution using Cramer's rule may be simplest.)