Pls help, need this to pass, will give brainliest

4

Step-by-step explanation:

Since the coefficients must be real and one of the roots is 1-i, then there has to be another root which is 1+i so that the coefficients can be real. Summing up all of the roots, we see there are 4 roots that just be part of the equation: 3, 4, 1-i, and 1+i. Since it is asking for the least, it has to be 4. Since the number of roots is the degree, the least it can be is 4.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

step-by-step explanation:

the true ones are a b and d