Express each of the following in a+bi form. a)(13 +4i)+(7 +5i)b)(5 − i)−2(1 − 3i)c)(3− i)(4 +7i)d)(3 − i)(4 +7i) − i(5 − i) − 2(1 − 3i)i

a)

b)

c)

d)

Step-by-step explanation:

a) The sum/difference of two complex numbers is given by:

so:

b) Using the previous property and the distributive property:

c)

Using a process similar to the previous one and taking into account that:

d) Using everything we used in the previous problems:

answer:

it will cost 480 dollars to refurbish the larger wood floor

step-by-step explanation:

as it's a ratio of 4 that costs 384 dollars, divide the price by the ratio

384 / 4 = 96 dollars

96 dollars per unit of the ratio

now to get the price to refurbish the larger wood floor, times the price by the units

96 * 5 = 480

whats the question?

step-by-step explanation: