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lianna [129]
2 years ago
5

Given f(x)=10-2x find f(7)

Mathematics
2 answers:
ad-work [718]2 years ago
7 0

f(7)=10-14=-4
Answer=-4 
Maru [420]2 years ago
3 0

Answer: -4

Step-by-step explanation: The equation is a simple function having two variables x and y. f(x) can also be written as y.

Therefore, another way to write a function is <em>y = 10-2x</em>.

The question requires you to insert the value of one variable and calculate the other. In this case you have to find the value of function when x=7.

Insert 7 in place of x. So, the equation will look as follows.  

f(x) = 10 - 2*7

f(x) = 10 - 14  

f(x) = -4

Therefore, when x=7 the value of our function f(x) is equal to -4.

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The amount of garbage, G produced by a city with population p is given by G = f(p). G is measured in tons per week, and p is mea
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P= 50,000 or 50 thousands

G= 13 Tons

The variable f isn't known.

So your equation would be 13 = 50 (f), if you were to put your known variables in the equation.

If you were to find variable f, you would divide 13 tons by 50,000 to get 0.00026 or in scientific notation: 2.6 x 10 (exponent(s):-4)



 

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Suppose 15% of the apples picked one afternoon are rotten.
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A bag contains 40 marbles. The probability of selecting a red marble at random is 1/5. How many red marbles are in the bag?
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Answer:

8 red marbles.

Step-by-step explanation:

All together we have 40 marbles. The fraction of marbles that are red is 1/5 which means that we should divide the total number of marbles, which is 40 by the denominator ( Bottom number of fraction ) 5 so that we get the number of groups that have 1 red marble in them. In this case we have 8 groups.

40/5=8

You always divide by the denominator ( Bottom number of fraction ) first and then you multiply your answer by the numerator ( Top number of fraction ) .

If each group has 1 red marble in it and we have 8 groups, it means that we have 8 red marbles in the bag.

1 * 8 = 8 red marbles in the bag

If the numerator (number above the fraction line) was more than one, then this would mean that we have more than 1 marble in each group of marbles.

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If we had 3/5 we would have 3 marbles in each group of marbles. This means that instead of doing 1 * 8 we would have to do 3 * 8 = 24. We would have 24 red marbles in the bag.

Easy and quick way if you do not need the explanation:

Another way we could do this is by simply multiplying the fraction ( 1/5 ) by the total number of marbles ( 40 ). This would still give us an answer of 8 red marbles in the bag. 40/5=8, 8*1=8

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