Part A: Scatter plot with best-fit line attached. You'll find the line to have equation (approximately)
The positive slope suggests that test scores and study time are directly are proportional.
Part B: Same as in a previous question you had posted. Pick two points on the provided line and compute the slope as best you can. For example, I might pick (2, 30) and (4, 40), which gives a slope of
and assuming the line passes through (2, 30) exactly, it would have equation
Answer:
Alex timed 7 by 2 instead of 7 times 7 because 7^2 is an exponent.
It makes a 74 degree angle.
The sides of the triangle that are given are the side adjacent to the angle the ladder makes with the ground and the hypotenuse of the triangle.
adjacent/hypotenuse is the ratio for cosine:
cos x = 7/25
To solve this, we will take the inverse cosine:
x = cos⁻¹(7/25) = 73.7 = 74
29.99-20%= 23.99
25.00-10%= 22.50 so, Mr.chang got the better deal ( but not by much.)
He has to wait 13 minutes for the 7:18 train
