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3 years ago

Simplify the following expression into the form a + bi, where a and b are rational numbers. (4-i)(-3+7i)-7i(8+2i), please help

Mathematics

2 answers:

olganol [36]3 years ago

8 0

Answer:

9-25i is the answer

atroni [7]3 years ago

7 0

9-25i is the answer to your question

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2. US$ 1.7135

Brrunno [24]

Answer:

1577.8 US dollars are received for 1127 UK pounds.

5669.5 UK pounds are received for US$7937.3.

Step-by-step explanation:

The questions are solved by proportions, using a rule of three.

How many US dollars are received for 1127 UK pounds?

1 UK pound = 1.4 US dollars

1127 UK pounds - x US dollars

Applying cross multiplication:

$x = 1127*1.4 = 1577.8$

1577.8 US dollars are received for 1127 UK pounds.

How many UK pounds are received for US$7937.3?

1 UK pound = 1.4 US dollars

x UK pounds - 7937.3 US dollars

$1.4x = 7937.3$

$x = \frac{7937.3}{1.4}$

$x = 5669.5
$

5669.5 UK pounds are received for US$7937.3.

4 0

3 years ago

What is the best estimate for the value of the expression? (34/8 - 16/3) - 14/9

Mazyrski [523]

That is your answer

8 0

3 years ago

Mary bought 25/50/50 policy with a $100 deductible on collision and $500 deductible on comprehensive coverage. If the base premi

9966 [12]

Answer: 918

Step-by-step explanation:

add 220+245+215+85 together and you get $765 and you multiply this with the 1.20 to get your solution/answer Plz rate and <3

7 0

3 years ago

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A circle has a sector with area 1/2π and central angle of 1/9π radians . What is the area of the circle? Either enter an exact a

Agata [3.3K]

Answer:

$9\pi$

Step-by-step explanation:

The area of a sector is given by;

$A= \frac{1}{2} {r}^{2} \theta$

From the given information, the central angle is

$\theta = \frac{ \pi}{9}$

and

$A= \frac{\pi}{2}$

Let us substitute and solve for the radius, r.

$\frac{ \pi}{2} = \frac{1}{2} \times {r}^{2} \times \frac{ \pi}{9}$

$1 = \frac{ {r}^{2} }{9}$

${r}^{2} = 9$

$r = \sqrt{9} = 3 \: units$

The area of a circle is given by:

$= \pi \: {r}^{2}$

Substitute the radius to get:

$= \pi \times {3}^{2} \\ = 9\pi$

7 0

4 years ago

Help!!! which is the correct answer

nataly862011 [7]

Answer:

There are no solutions

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers