A rancher wants to build a fence to enclose an 1800square meter rectangluar field for cattle. The fence along one side is to be made of heavy-duty material that costs $12 per meter. The material along the remaining three sides costs only $7 per meter. Find the dimensions and total cost of fencing the field that is the least expensive to fence.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

the correct answer is x/3+10≥32

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