Answer: 120
Step-by-step explanation:
Because it is
Step-by-step explanation:
A left Riemann sum approximates a definite integral as:

Given ∫₂⁸ cos(x²) dx:
a = 2, b = 8, and f(x) = cos(x²)
Therefore, Δx = 6/n and x = 2 + (6/n) (k − 1).
Plugging into the sum:
∑₁ⁿ cos((2 + (6/n) (k − 1))²) (6/n)
Therefore, the answer is C. Notice that answer D would be a right Riemann sum rather than a left (uses k instead of k−1).
I got this on the calculator.
The greatest common factor of 32 and 52 is: 4
Factors of 32: 1, 2, 4, 8, 16, 32
Factors of 52: 1, 2, 4, 13, 26
The common factors between them are 1, 2, 4, but the greatest common factor between them is 4.
The train will have been traveling for 4 hours
train A=45,90,135, 180
train B=0,60,120,180