When simplifying the expression 24i- 12+36i, which step below applies the commutative property of addition? A: (24i - 12) + 36i
B: 24i + 36i- 12
C: 24i + (-12 + 36i)
D: 12(2i - 1 +3i)

15. Use the associative property of addition to simplify 5.2 - (4.1 - 42i).

A: 9.3 + 42i
B: 1.1 +421
C: 1.1 - 42i
D: 9.3 - 42i

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species