Answer: 12. 1.25 = slope
13. -1/2 = Slope
14. Take two points from the line on the graph and then use the slope formula, y2 - y1/x2 - x1 to get your slope.
15. Use the points in the equation y2 - y1/x2 - x1 to get your slope. Remember to simplify.
Step-by-step explanation:
12. = -6 - 9/ -8 - 4 = 1.25 = slope
13. =-10 - (-3)/9 - (-5) = -1/2 = Slope
You need to fin b
remember y=mx+b
(1,3)
m=-4x
y=3
3=-4(1)+b
3=-4+b
b=7
final answer
y=-4x+7
If we know that she got 75%, we can write it as the fraction 75/100.
We also know that she got 60 correct out of an unknown number of questions, which we can call 'x'
We means we know that 75/100 = 60/x (the number of questions)
Cross multiply to get an equation.
75 * x=60 * 100 -----> 75x=6000
Divide both sides by 75 to solve for x.
6000/75=80
x=80, meaning that her test had 80 questions on it.
Sorry, it's late, and I'm a bad explainer.
The error is adding (2x-12) with x and 30. This is wrong because you are adding the angles inside the triangle and you are assuming that (2x - 12) is the unlabeled angle INSIDE the triangle, when it is the exterior angle/outside of the triangle.
A straight line is also 180°.
(2x - 12) + ? = 180
30 + x + ? = 180
If you look at the equations, and put parentheses around 30 + x, (30 + x) and (2x - 12) should be the SAME NUMBER. So you could set them equal to each other to find x. (or you could also look at the picture and see that they both need/are missing the same angle)
2x - 12 = 30 + x
x = 42
Now you plug 42 into the exterior angle equation
2(42) - 12 = 84 - 12 = 72°
A squared + b squared = c squared
8.6^2+14.7^2=c^2
73.96+216.09=c^2
square root both sides and...
c=17.03085
Your answer is A
Hope this helps
