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3 years ago

BRAINLIEST MATH QUESTION!!

Mathematics

1 answer:

slavikrds [6]3 years ago

3 0

Step-by-step explanation:

= 3x²(x + 2) - 7(x + 2)

= (x + 2)(3x² - 7)

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The sum of 3 consecutive integers is 2190. what is the value of the smallest integer?

Svet_ta [14]

Answer:

3x+2=2190

3x=2190-2

3x=2188

x=2188÷3

x=729

5 0

2 years ago

HELP PLS!! ILL GIVE POINTS !! :(( m

vesna_86 [32]

Answer: Choice D

15(cos85° + i sin85°)

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Explanation:

Let's say we had these two general complex numbers, which are in polar form.

$z_1 = r_1*\left(\cos(\theta_1)+i*\sin(\theta_1)\right)\\\\z_2 = r_2*\left(\cos(\theta_2)+i*\sin(\theta_2)\right)\\\\$

We can abbreviate them into the shorthand form

$z_1 = r_1*\text{cis}(\theta_1)\\\\z_2 = r_2*\text{cis}(\theta_2)\\\\$

The notation "cis" stands for "cosine i sine".

Now that we have those complex numbers set up, multiplying them is as simple as saying this:

$z_1*z_2 = (r_1*r_2)*\text{cis}(\theta_1+\theta_2)$

We do two basic things:

Multiply the r values out front
Add the theta values inside the the cis function

---------------------------------------

With all that in mind, let's tackle the problem your teacher gave you.

The given complex numbers

$z_1 = 5*\left(\cos(15^{\circ})+i*\sin(15^{\circ})\right)\\\\z_2 = 3*\left(\cos(70^{\circ})+i*\sin(70^{\circ})\right)\\\\$

abbreviate into

$z_1 = 5*\text{cis}(15^{\circ})\\\\z_2 = 3*\text{cis}(70^{\circ})\\\\$

then those multiply to

$z_1*z_2 = (r_1*r_2)*\text{cis}(\theta_1+\theta_2)\\\\z_1*z_2 = (5*3)*\text{cis}(15+70)\\\\z_1*z_2 = 15\text{cis}(85^{\circ})\\\\z_1*z_2 = 15\left(\cos(85^{\circ})+i\sin(85^{\circ})\right)\\\\$

which is why choice D is the final answer.

7 0

3 years ago

Pls help me with this question i only get one try

DiKsa [7]

Answer: 144,000 typewriters

Step-by-step explanation:
Ok so, use the formula I= PRT.
Principal, rate, and time.

First, turn the % into 100..
Or just move the decimal two times to the right.
= 0.20

Next, Skip this. There is no next ‍♀

Finally, multiply. 120,000× 0.20 × 6
Giving you the answer of, 144,000 typewriters.

Hopefully this helps ‍♀

5 0

3 years ago

What is the quotient? 5)50 O A. 1 O B. 5 O C. 10 o D. 2

shtirl [24]

Answer:10

Step-by-step explanation: used calculator hopes this helped

4 0

3 years ago

Read 2 more answers

Pleaseeeeeeeeeee help

pickupchik [31]

Answer:

136

Step-by-step explanation:

35+35+42+12+12 =

70+42+24=

112+24=

136

6 0

2 years ago