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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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nikklg [1K]
Make the whole number a fraction. so if youre number is 16 make it 16/1. Then you can go on. 
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3 years ago
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Find the volume of the spear. Give your answer to the nearest cubic unit. 5mm
Colt1911 [192]

Answer:

b.\:\: 524 \:  {mm}^{3}

Step-by-step explanation:

V_{sphere}  =  \frac{4}{3}  \pi \:  {r}^{3}   \\  \\  = \frac{4}{3}  (3.1416) \:  {(5)}^{3} \\  \\  = 523.6 \\  \\  \implies \: V_{sphere}  \approx 524 \:  {mm}^{3}

7 0
3 years ago
PLEASE ASAPPPPP I NEED ITTTT
Pachacha [2.7K]
Do you know the equation to use
6 0
2 years ago
Please help me out please
icang [17]

Answer:

Your answer is <em>8.06</em>.

Step-by-step explanation:

Since you're finding the hypotenuse of the triangle through Pythagorean theorem, you need to use the formula:

a² + b² = c²

Here, you have to remember that x is the same as c in the formula. c is the hypotenuse and x.

a is going to be your smallest leg, so in this case a = 4.

b is going to be your longest leg, so it is b = 7.

Now, you don't know what c yet is so you simply write it as:

4² + 7² = c²

Do the exponents.

16 + 49 = c²

Add.

65 = c²

Now you need to get the exponent away from the c. To do that, all you have to do is square root both sides.

√65 = √c2

Once you do that, you have your answer!

<u>8.0622577483 = c</u>

Now just simplify and you're done :)

<u>8.06</u>

<u />

<u />

<u />

Might sound hard now but you'll get the hang of it.

6 0
3 years ago
Please help me solve this :)
Effectus [21]

Answer:

105 cm

Step-by-step explanation:

Table + cat - mouse = 120 ...(1)

table + mouse - cat = 90 ...(2)

(1)+(2): 2*Table = 210

Table = 105

8 0
3 years ago
Read 2 more answers
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