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NNADVOKAT [17]
3 years ago
12

Help please i’m in the middle of a test

Mathematics
1 answer:
MA_775_DIABLO [31]3 years ago
6 0

Answer:

None of your options

Step-by-step explanation:

(7 - 3i) + ( x - 2i)^2 -(4i^2 + x^2)\\\\(7 - 3i) + (x^2 - 4 - 4xi) - (-4 + x^2)\\\\7 - 3i + x^2 - 4 - 4xi + 4 - x^2\\\\7 -i(3+4x) - 4 + 4 - x^2 + x^2\\\\7 - (4x + 3)i

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5540 in scientific notation
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Answer:

Therefore, the decimal number 5540 written in scientific notation is 5.54 × 103 and it has 3 significant figures.

Step-by-step explanation:

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3 years ago
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Mr. Walker, a runner, asked students to find the unit rate of the winner of the first Boston Marathon in 1897. John J. McDermott
EleoNora [17]

Answer: 8.4 miles per hour

Step-by-step explanation:

Since, total distance = 24.5 miles,

Time taken =  175 \text{ minutes} = \frac{175}{60} \text{ hours} =\frac{35}{12} \text{ hours}

Thus,

\text{ The unit rate} = \frac{\text{ Total distance}}{\text{ Time taken}}

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6 0
2 years ago
Which graph shows the correct solution to the linear-quadratic system of inequalities below?
LUCKY_DIMON [66]

Answer:

(the pic)

Step-by-step explanation:

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3 years ago
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5(3x + 9) – 2x = 15x – 2(x - 5)
Delvig [45]

Answer:

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Step-by-step explanation:

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3 years ago
Find the sum of this infinite geometric series where a1=0.3 and r=0.55
Lisa [10]
Hello, Marymack!


We know that in a geometric sequence defined by \mathsf{a_1} and \mathsf{r} , the sum can be calculated the following way:

\mathsf{S_n = \dfrac{a_1}{1-r}}\\ \\ \\ \\ \mathsf{S_n = \dfrac{0.3}{1-0.55}}\\ \\ \\ \mathsf{S_n = \dfrac{0.3}{0.45}}\\ \\ \\ \boxed{\mathsf{S_n = \dfrac{2}{3}=0.666...}}
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3 years ago
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