Answer:
14) F
15) D
Step-by-step explanation:
14
You have 80 minutes on a CD, minus the time you burned would equal the time you have left on the CD.
15
To find mark down, you multiply the percentage to the original price, and then subtract the answer to the original price.
Hey there!
2x^2 - 5 / x + 9
= 2(-1)^2 - 5/ -1 + 9
= (2(-1)^2 - 5) / (-1 + 9)
= (2(1) - 5) / 8
= (2 - 5) / 8
= -3 / 8
≈ -0.375
Therefore, your answer is:
-3/8 OR -0.375
EITHER OF THOSE SHOULD WORK BECAUSE THEY ARE EQUIVALENT TO EACH OTHER!
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)
If you have some knowledge of complex numbers: This follows pretty much immediately from Euler's formula and DeMoivre's theorem,
(Euler)
(DeMoivre)
so that is the imaginary part of the expanded left hand side.
If that's unfamiliar to you, you can make use of several identities to expand :
(double angle sine)
(double angle sine and cosine)
(Pythagorean)
3/4(24-8x)-16=-2/3(6x-9)
multiply 24 and 3/4 which equals 18 and then -8x times 3/4 which equals -6x
then foil again on the other side
-2/3 times 6x equals -4 then -2/3 times -9 equals 6
18-6x-16=-4x+6
combine like terms
2-6x=-4x+6
+6x +6x
2=2x+6
-6 -6
-4=2x
divide 2 on both sides
-2=x
:)