The cost of a coffee is determined by the type of coffee beans that are mixed together. the cost of a local mix of arabica and robusta beans is molded by the equation below, where a= the pounds of arabica and r= pounds of robusta 700a+1200r=1,000,000 if a mixture contains 1000 pounds of arabica bean, how many pounds of robusta beans should be in the mixture

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3