Which expression represents the number 2i4−5i3+3i2+−81‾‾‾‾√ rewritten in a+bi form?

−5+7i

5−1

−1+7i

−1+14i

The expression represents  the number rewritten in a+bi form.

Step-by-step explanation:

The value of is in term of

Substituting the value,

Product of two negative numbers is always positive.

Now in term of

Substituting the value,

Product of one negative  and one positive numbers is always negative.

Now can be written as follows,

Applying radical multiplication rule,

Now, and

Now substituting the above values in given expression,

Simplifying,

Collecting similar terms,

Combining similar terms,

The above expression is in the form of a+bi which is the required expression.

Hence, option number 4 is correct.

answer is more than one

step-by-step explanation:

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.