Given the following message and carrier equations, determine the AM modulated signal equation: m(t)=3cos(2π4kHz*t), c(t)=2cos(2π3MHz*t) a. s(t)=3[1 + 0.67cos(2π4000t)]cos(2π3E6t) b. s(t)=2[1 + 1.5cos(2π4000t)]cos(2π3E6t) c. s(t)=3[1 + 0.67cos(2π3E6t)]cos(2π4kHz*t) d. s(t)=2[1 + 1.5cos(2π3MHz*t)]cos(2π4000t)

Two farmers pay a total rent of $140 for a pasture. the first farmer placed $4 oxen in the pasture, and the second farmer placed $30 sheep in the pasture. the farmers split the rent based on the proportion of the pasture eaten by their own animals that month. how much should the first farmer pay, if 1 ox eats as much as 10 sheep in a month?