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satela [25.4K]
4 years ago
5

If y varies directly as x and y=12 when x=72, find x when y=9

Mathematics
2 answers:
mafiozo [28]4 years ago
8 0
You can do 12/72 = 9/x. You cross multiply and it becomes 12x = 648. Divide 648 by 12, and x equals 54.
lapo4ka [179]4 years ago
5 0
9 x 72 = 648

648 ÷ 12 = 54

x = 54

Hope this helps :)
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Henry is taking a medicine for a common cold. The table below shows the amount of medicine f(t), in mg, that was present in Henr
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Geometric sequence general form: a * r^n
For Greg, we are given the elimination of the medicine as a geometric nth term equation:
200 * (0.88)^t
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To compare the decrease in medicine in the body between the two, it is useful to get them in a common form;
So, using the data provided for Henry, we will also attempt to find a geometric nth term equation that will work if we can:
As a geometric sequence, the first term would be a and the second term would be ar where r = multiplier;
If we divide the second term by the first term, we will therefore get r, which is 0.94 for Henry;
We can check that the data for Henry can be represented as a geometric sequence by using the multiplier (r) to see if we can generate the third value of the data;
We do this like so:
282 * (0.94)^2 = 249.18 (correct to 2 d.p)
We can tell that the data for Henry is also a geometric sequence.
So now, we just look at the multiplier for Henry and we find that every hour, the medicine decreases by 6%, half of the rate of decrease for Greg.

The answer is therefore that <span>Henry's body eliminated the antibiotic at half of the rate at which Greg's body eliminated the antibiotic.</span>
3 0
3 years ago
Read 2 more answers
How would i write 4.67 as a mixed number?
gavmur [86]
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8 0
3 years ago
The following figure shows A ABC with side lengths to the nearest tenth.
xz_007 [3.2K]

Answer:

17.7

Step-by-step explanation:

angle B = 180 - 81 - 65 = 34 degrees

as the sum of all angles in any triangle is always 180 degrees.

a/sin(A) = b/sin(B) = c/sin(C)

the sides are always on the opposite side of the angle.

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10/sin(34) = AB/sin(81)

AB = 10×sin(81) / sin(34) = 17.7

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Answer:

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Step-by-step explanation:

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3 years ago
A dial combination lock has dials numbered 0 to 5. The lock is set to an even number. How many different numbers could it be?
Butoxors [25]

The number of combinations will be 6 for even numbers.

<h3>What is the combination?</h3>

The arrangement of the different things or numbers in a number of ways is called the combination.

Given that:-

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The total sample numbers are from 0 to 5 which are 0,1,2,3,4,5.

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