Simplify the expression to a + bi form: (9 – 2i) + (-2 - 5i)

Mathematics

2 answers:

NARA [144]3 years ago

4 0

Answer:

7-7i

Step-by-step explanation:

Yuliya22 [10]3 years ago

3 0

Answer:

7-7i

Step-by-step explanation:

(9-2i)+(-2-5i)

9-2i-2-5i

9-2-2i-5i

7-2i-5i

7-7i

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The test scores of a geometry class are given below.

sukhopar [10]

Variance is the difference of the number from the mean of the group of numbers then square it and find the average. In this case, we need to find the mean first. 90 + 75 + 72 + 88 + 85 = 410/5 = 82 . Now we must get the difference of each from the mean.
90 - 82 = 8
75 - 82 = -7
72 - 82 = -10
88 - 82 = 6
85 - 82 = 3
Next is to find the average of the square of the numbers.
(8^2) + (-7^2) + (-10^2) + (6^2) + (3^2) is
64 + 49 + 100 + 36 + 6 = 255. Next step is to simply divide it by 5. The numerator in calculating the variance is the sum of the square of the numbers which is 255.

7 0

3 years ago

Read 2 more answers

T+b = 41 t = 2b+2 Solve for t and b

erastovalidia [21]

Answer: b=13, t=29

Step-by-step explanation:

Substituting the first equation into the second,

$2b+2+b=41\\\\3b+2=41\\\\3b=39\\\\b=13\\\\\implies t=2(13)+2=29$