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balu736 [363]
3 years ago
7

4a+6b=10 2a-4b=12 what does 12a =?

Mathematics
1 answer:
harina [27]3 years ago
8 0
1/2(4a + 6b = 10)
2a + 3b = 5

2a + 3b = 5
-) 2a - 4b = 12
7b = -7
b = -1

Substitute:
2a - 4(-1) = 12
2a + 4 = 12
2a = 8
a = 4

12a = 12(4) = 48

This is a little longer way to do it, but I think it's easier to understand
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7−5p+3q when p=1p=1 and q=7q=7
shutvik [7]

Answer:

23

Step-by-step explanation: Substitute 1 for p & 7 for q

7 − 5p + 3q

7 - 5(1) + 3(7)

7 - 5 + 21

7 + 16

23


Hope this helps you!!! :)

4 0
3 years ago
Read 2 more answers
The volume of a sphere is 3,000π m3. What is the surface area of the sphere to the nearest square meter? 165 m2 2,158 m2 1,079 m
DENIUS [597]
To solve this problem and calculate the area of the sphere, you must apply the following formulas:

 Formula N° 1:

 V=4/3(πr³)  

 V is the volume of the sphere (V=3,000π m³).
 r is the radius.

 Formula N° 2:

 A=4πr²

 A is the area of the sphere.
 r is the radius.

 As you can see, you don't have the value of the radius "r". So, you must rewrite the Formula N° 1, and clear "r":

 V=4/3(πr³)
 (3,000)(3)=4πr²
 r³=9,000/4π
 r=(9,000/4π)<span>^1/3
</span> r=13.1037 m

 Then, to calculate the area of the sphere, you must substitute the value of "r" into the Formula N° 2:

 A=4πr²
 A=4π(13.1037)²
 A=2,158 m²

 <span>What is the surface area of the sphere to the nearest square meter?
</span>
 The answer is: 2,158 m²
8 0
3 years ago
What is the slope of this graph? <br><br> A. -1/3<br><br> B. -3<br><br> C. 3<br><br> D. 1/3
-Dominant- [34]

Answer:

B

Step-by-step explanation:

The formula is rise over run... your rise is negative 3 and your run is one... -3/1 is the same as -3

5 0
3 years ago
Read 2 more answers
Solve graphically
kicyunya [14]
  3x + 2y = 12                              5x - 2y = 4
 -3x           -3x                             -5x          -5x
2y = 12 - 3x                                      -2y = 4 - 5x
divide by 2 on both sides            divide by -2 on both sides
y = 6 - 3/2x                                        y = -2 + 5/2x
3 0
3 years ago
Solve. <br> 3 + x = 4x + 12
mart [117]

Answer:

-3

Step-by-step explanation:

this is because you subtract 4x from one side to get -3x +3= 12. then u get rid of the 3 so you subtract is and get -3x=9. therefore u get -3. (please don’t delete my answer when I take time out of my day to help you)

8 0
3 years ago
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