Okay, you will need to use the law of cosines for this problem.
The Law of Cosines states (in this case): a^2 = b^2 + c^2 - 2 * b * c * cos A, where "a" is the side opposite angle A (7 inches), and b and c are the other two sides.
Plug the numbers in and you get: 7^2 = 5^2 + 9^2 - 2 * 5 * 9 * cos A, or:
49 = 25 + 81 - 90 * cos A.
Subtract (25 + 81) from both sides to get:
-57 = -90 * cos A.
Divide by -90 on both sides:
cos A = 19/30
To find A, you do the inverse trigonometric function to get:
cos^-1 of (19/30) = A.
I don't have a calculator that can do this right now, but if you plug the left side of the above equation into it (make sure it is in degrees, not radians), you should get A.
Area of trapezoid = 1/2 (sum of parallel sides) × (perpendicular distance between them)
DС = 2 + 12 + 2 = 16 in
Area = 1/2 (16 + 12) × 9 = 14 × 9 = 126 in²
Answer:
Hi, there the answer will D. (-3,-4)
Step-by-step explanation:
If we see the pattern LOOK AT THE X VALUE
WE ALREADY HAVE
12,3,2,5,-8.
THAT'S MEANS YOU CAN HAVE THE SAME X VALUE SO I PICKED D BECAUSE THERE IS NO -3 IN THE PATTERN
Hope this helps :)
To find cost per each you divide $18 by 8 and get $2.25 per book.
To find how much for $27 you divide by $2.25 and get 12 books