- Let A be the area of a circle with radius r. If dr/dt=4, find dA/dt when r=3.?

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What is the mole ratio of Oxygen (O2) to sulfur dioxide (SO2) indicated in the balanced equation 4FeS + 7O2 - 2Fe2O3 + 4SO2? How do you solve this?? by substitution of u=cos2x find integration of sin^5 2x dx?? The number of terms in the expansion of {[(a+3b)^2(a-3b)^2]^2} , when simplified, is? Write an equation for a line perpendicular to y = − 4 x + 4 y and passing through the point (4,6)? What if Earth was farther from Sun and Sun was a blue supergiant?