2(3h - 9) when h = 4.2

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7.2

Step-by-step explanation:

2(3h - 9) when h = 4.2

Plug the value into the expression

We have

2 (3 x 4.2 - 9)

2(12.6 - 9)

Simplify the bracket

2 (3.6)

2 x 3.6

7.2

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.

10

step-by-step explanation: