Answer:
Cosine Formula :
AC² = AB² + BC² - 2(AB)(BC)cosB
AC² = (40)² + (60)² - 2(40)(60)cos(115°)
AC² = 1600 + 3600 - (4800×(-0.42))
AC² = 5200 + 2016
AC² = 7216
AC = √(7216)
AC = 84.95 km
Hence, the distance of the straight line AC is <u>84.95 km</u>
- <u>84.95km</u> is the right answer.
Since the quadratic formula of ax^2+bx+c is
x=(-b+-(plus OR minus) sqrt (b^2-4ac))/2a, we can get that a is 1 (since 1*x^2 is x^2), b is 4, and c is -16, so x=(-4+-sqrt((-4)^2-4*1*(-16)))/2*1
= (-4+-sqrt(16-(-64)))/2=(-4+-sqrt(80))/2 which is either (-4+sqrt(80))/2 or
(-4-sqrt(80))/2. Since 80 is divisible by 4 (aka 2 squared), we can write sqrt(80) as 2*sqrt(20) as 4 goes into 80 20 times, getting (-4+2sqrt(20))/2 or
(4-2sqrt(20))/2, and crossing out the 2's we get (-2+sqrt(20)) or (-2-sqrt(20))
It is a function.
This is because each x value only has 1 corresponding y value.
It is not linear. The difference between y values from each incrememnt of x is inconsistent. The first 3 increase by 0 but the last one increases by 1.
Answer:
64 square feet
Step-by-step explanation:
A = s² = 8² = 8*8 = 64