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Lera25 [3.4K]
3 years ago
11

If f(x) = 3x +9 x when f(x) = 30

Mathematics
1 answer:
den301095 [7]3 years ago
3 0

Answer:

x=5/2

Step-by-step explanation:

When f(x)=30, we have 3x+9x=30.

Combining like terms on the right side, we have 12x=30.

Finally, dividing by 12 we get x=30/12.

We note that 30=6*5 and 12=6*2, so 30/12=5/2.

So, \boxed{x=5/2} and we're done!

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Korvikt [17]

The answer to the question is 112°

First, you must set up an equation to find x.

2(3x+10)+2(2x)=360\\

Then, you must use distributive property to simplify the parentheses.

6x+20+4x=360

Next, add like terms.

10x+20=360

Then, subtract 20 on each side.

10x=340

Next, divide 10 on each side.

x=34

Now, you must substitute 34 in for x.

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Answer:

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Aliun [14]

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Step-by-step explanation:

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