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tigry1 [53]
3 years ago
14

Multiply the following complex numbers (7 + 2i)(2+3i) O A. 20-25i B. 8-25i O C. 8+ 25i O D. 20-25i​

Mathematics
1 answer:
ruslelena [56]3 years ago
5 0

Đáp án là C: 8+25i nhé

8+ 25i

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solve systems of equation. equation number 1: 9 x squared + 4 y squared equals 144. equation 2: x squared plus y squared equals
grigory [225]
9x^{2} + 4y^{2} =144
x^{2} + y^{2}=24

9x^{2} + 4y^{2} =144
 4x^{2} + 4y^{2}=96
by the difference 
5x^{2}=48
so x=\sqrt{\frac{48}{5}} or x=-\sqrt{\frac{48}{5}}
and y^{2}=24-\frac{48}{5}
then y=\sqrt{\frac{72}{5}} or -\sqrt{\frac{48}{5}}
5 0
3 years ago
The circular blade on a saw has a diameter of 7.5 inches and rotates at 2400 revolutions per minute.
Archy [21]
For a:
    
       (2400*2*PI)/60(seconds) = 80 PI RAD/Sec

For b: 
   
        arc length s= radius r * central angle(in radians) 

                          = ((80*pi*7.5)/(2*pi)
                          =25


                          



4 0
3 years ago
Can someone help me with these two questions.
strojnjashka [21]
I am sorry but I don’t have enough information to answer the question
7 0
3 years ago
HELP ME OUT ASAP PLS 20POINTS IF U DO! On Friday, a bowling alley made $842.72 from lane rentals and $412.38 from the concession
ElenaW [278]

Answer:

  $2611.05

Step-by-step explanation:

  earnings = lane rentals + concessions

<u>Friday</u>:

  earnings = $842.72 +412.38 = $1255.10

<u>Saturday</u>:

We assume "down by 1/8" means the value was 1 -1/8 = 7/8 that of the previous day. Likewise, "increased by 1/2" is assumed to mean the value was 1 + 1/2 = 3/2 that of the previous day.

  earnings = 7/8×$842.72 + 3/2×412.38 = $1355.95

__

Then the total earnings for both days were ...

  $1255.10 +$1355.95 = $2611.05

7 0
3 years ago
Read 2 more answers
Simplify. <br> If m = -6, evaluate -m <br> A) 0<br> B) -6<br> C) 6<br> D)12
VMariaS [17]

m = -6

 evaluate -m


so -m = -(-6) which would equal 6

 Answer is C

3 0
3 years ago
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