1st on left is the greater than
2nd on left is less than
1st on right is greater than or equal to
2nd on right is less than or equal to
Answer:
Step-by-step explanation:1.
Use law of cosine.
AB^2 = AC^2 + BC^2 - 2 * AC * BC * cos(angle ACB)
AB^2 = 53^2 + 71^2 - 2(53)(71)cos(53)
Using calculator,
AB = about 57.6259 feet
2.
Law of cosine again.
d^2 = 400^2 + 90^2 - 2(400)(90)cos(45)
using calculator,
d = about 342.3278 feet
43.85 + (2*2.70) - (2*1.10) - 4.45 = $42.60
Or more simply 43.85 + 2.70 + 2.70 - 1.10 - 1.10 - 4.45 = $42.60
A is true, because a parabola is a second degree polynomial, and as such is defined everywhere.
B is true, because the graph of the function never goes below the x axis.
C and D are false because they negate A and B