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3 years ago

Multiply the following complex numbers: (9-21)(7 +61)

Mathematics

2 answers:

labwork [276]3 years ago

8 0

Answer:

-816

Step-by-step explanation:

you subtract 9-21 to get -12 then you take 7+61 which is 68 and then you multiply them to get -816

Andrew [12]3 years ago

3 0

Answer:

-816

Step-by-step explanation:

-12*68= -816 this is probably wrong but this is what i got

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You earn $20.00 per hour at your job. If you get a 10% raise at the end of each year, what will your hourly rate, h, be after 8

lesya [120]

The answer is $42.87

$h = C(1 +r)^{t}$

We know:
C = $20.00
r = 10% = 10%/100% = 0.1
t = 8 years
h = ?

h = 20 * (1 + 0.1)⁸
h = 20 * (1.1)⁸
h = $42.87

6 0

3 years ago

what is the image of the point (4,-8) after a rotation of 270 degrees counterclockwise about the orgin

marysya [2.9K]

Answer:

(-8,-4)

Step-by-step explanation:

(y,-x)

8 0

3 years ago

-25=-5/9v solve for v

Oksi-84 [34.3K]

Answer: v = 18

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6 0

3 years ago

I need help figuring out what I did wrong

rewona [7]

Answer:

Step-by-step explanation:

Using the addition formula for sine

sin(a + b) = sinacosb + cosasinb

and the exact values

sin( $\frac{\pi }{4}$ ) = cos( $\frac{\pi }{4}$ ) = $\frac{\sqrt{2} }{2}$ , cos( $\frac{\pi }{6}$ ) = $\frac{\sqrt{3} }{2}$ , sin( $\frac{\pi }{6}$ ) = $\frac{1}{2}$

Note that $\frac{5\pi }{12}$ = $\frac{\pi }{4}$ + $\frac{\pi }{6}$ , thus

sin( $\frac{5\pi }{12}$ )

= sin( $\frac{\pi }{4}$ + $\frac{\pi }{6}$ )

= sin( $\frac{\pi }{4}$ )cos( $\frac{\pi }{6}$ ) + cos( $\frac{\pi }{4}$ )sin( $\frac{\pi }{6}$ )

= ( $\frac{\sqrt{2} }{2}$ × $\frac{\sqrt{3} }{2}$ ) + ( $\frac{\sqrt{2} }{2}$ × $\frac{1}{2}$ )

= $\frac{\sqrt{6} }{4}$ + $\frac{\sqrt{2} }{4}$

= $\frac{\sqrt{6}+\sqrt{2} }{4}$ → D

4 0

3 years ago

Read 2 more answers

How would you simplify this? Please help

kolbaska11 [484]

$8^{\frac{4}{3}} = \sqrt[3]{8^4} = \sqrt[3]{(2^3)^4} = \sqrt[3]{2^{3*4}} = 2^4 = 16$

Answer: C (16).

$2\sqrt{6} - 6\sqrt{54} = 2\sqrt{6} - 2 * 3 * \sqrt{6} * \sqrt{9} = 2\sqrt{6}(1-3\sqrt{9}) = 2\sqrt{6}(1-3*3) = 2\sqrt{6}(1-9)=2*\sqrt{6}*(-8) = -16\sqrt{6}$

3 0

3 years ago

Read 2 more answers