The cost, c, to produce b baseball bats per day is modeled by the function c(b) = 0.06b2 – 7.2b + 390. what number of bats should be produced to keep costs at a minimum?
27 bats
60 bats
174 bats
390 bats

21 stacks

step-by-step explanation:

divide 630/30

21 stacks

enjoy!

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.