Not so sure about the second one, but the first one is pretty simple:
The area of a circle = pi x radius^2
Since you need to find the area of the entire dvd, I'm assuming they mean if the hole in the center wasn't there, so add that to the diameter.
12+1.5 = 13.5
Half of the diameter is the radius, so half of 13.5 = 6.75
Now, multiply pi (3.14) by the radius, but have the radius squared. You'd write the equation like this:
3.14 x 6.75^2 (or on paper, the ^2 would be a small two diagonal from the 5)
Actual answer: 143.06625
You can round that to 143.
C
Step-by-step explanation:
This has a U like shape so it a parabola.
Parabola correlate with quadratic functions
Since it Going down, the answer is C -x^2.
Answer:
m = 19
Step-by-step explanation:
With a rate of change of -8
27 - 8 = 19
16 - 8 = 11
so m = 19
Answer:
Mistake -2(x+5)=-2x+10, -2(x+5)=-2x-10
Step-by-step explanation:
7(x-10)-2(x+5)=4x-7+6x-3
7x-70-2x-10=10x-10
5x-80=10x-10
-80+10=10x-5x
-70=5x
-70/5=x
-14=x
This is a right triangle, the measure of angle A is 90 degrees.
First thing to do I guess is finding B and C.
tan^-1 (7/12) = 30 degrees
tan^-1 (12/7) = 60 degrees
60 + 30 = 90
180 - 90 = 90. Therefore angle A = 90 degrees