Y= -5x -4 because you would do slope intercept form and sub the y and x in for -4 and 0
Answer:
x^2 + 2x^2 + 1 = x^4 + 2x^2 +1
Step-by-step explanation:
pythagorean theorem
a^2 + b^2 = c^2 where a and b are the legs
substitute what we know
(x^2 -1)^2 + (2x)^2 = (x^2+1)^2
FOIL
(x^2 -1)^2 = (x^2-1 ) (x^2-1) = x^4 -x^2 - x^2 +1 = x^4 -2x^2 +1
(2x)^2 = 4x^2
(x^2+1)^2 = (x^2+1 ) (x^2+1) = x^4 +x^2 +x^2 +1= x^4 + 2x^2 +1
substitute these back in
x^4 -2x^2 +1 +4x^2 = x^4 + 2x^2 +1
combine like terms
x^2 + 2x^2 + 1 = x^4 + 2x^2 +1
Since the left and right side are equal, this is a right triangle
It would be between 11 and 12 because 11 times 11 = 121 and that is smaller than 123. Also 12 times 12 is 144 and 12 a whole number.
The speed at which the distance is covered by the two vehicles is the sum of their speeds:
... (truck speed) + 1.5×(truck speed) = 2.5×(truck speed)
The time required to cover the distance is inversely proportional to speed, so is
... (2.5 hours)/2.5 = 1.0 hours
It takes 1.0 hours for the vehicles to meet.
_____
The speed of the truck is (145 mi)/(2.5 h) = 58 mi/h
The speed of the car is 1.5 × 58 mi/h = 87 mi/h.
The speed at which they move toward each other is
... 58 mi/h + 87 mi/h = 145 mi/h
So, the time it takes to cover 145 miles is
... (145 mi)/(145 mi/h) = 1.0 h
Step-by-step explanation:
¹/25y²-81
(⅕y)²-9². apply a²-b²=(a+b)(a-b)
(⅕y+9)(⅕y-9)
hope this helps you.