Cody summer sells tires for tractor trailers. he earns 4.5 percent commission on the first $6,000, 8 percent on the next $6,000, and 12 percent on sales over $12,000. last month he sold $18,000 worth of tires. what was his total commission?

True or false? a triangle can be circumscribed about a given circle

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i