Δabc has three sides with these lengths: ab = 9, bc = 40, and ca = 41. what is the value of cos c? a. `9/41` b. `40/9` c. `40/41` d. ` 9/40`

C

using the cosine rule

cosC = ( a² + b² - c² ) / (2ab )

with a = 40, b = 41 and c = 9, then

cosC = ( 40² + 41² - 9² ) /( 2× 40 × 41 ) = = → C

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step-by-step explanation:

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3