Answer:
1.46
Step-by-step explanation:
First find the the mean score before he made a 90.

Now add the score of 90 and calculate.

Subtract the two scores.

His mean test score increased by 1.46.
Y=2/3x-3. Follow the formula y=Mx+b. M is the slope, and b is the y intercept.
The slope intercept form of equation of required line is y = 3x + 9
What is equation of line in slope intercept form?
The most general form of equation of line in slope intercept form is given by y = mx + c
Where m is the slope of the line and c is the y intercept of the line.
Slope of a line is the tangent of the angle that the line makes with the positive direction of x axis.
If
is the angle that the line makes with the positive direction of x axis, then slope (m) is given by
m = 
The distance from the origin to the point where the line cuts the x axis is the x intercept of the line.
The distance from the origin to the point where the line cuts the y axis is the y intercept of the line.
Here,
Slope = 3
The line passes through (8, 33)
Equation of required line
y - 33 = 3(x - 8)
y - 33 = 3x - 24
y = 3x - 24 + 33
y = 3x + 9
To learn more about equation of line in slope intercept form, refer to the link:
brainly.com/question/25514153
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Answer:
I think 5
Step-by-step explanation:
Answer:
(5r-4)(4r^(2)+3)
Step-by-step explanation:
Hope it helps