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MaRussiya [10]
3 years ago
7

Im confused can somebody help me please

Mathematics
1 answer:
ivann1987 [24]3 years ago
6 0

well, we know the piece-wise function is f(x)= \begin{cases} 7x+10&x < 0\\\\ 7x+20&x\geqslant 0 \end{cases}

hmmm so what's f(-1), namely what is f(x) when x = -1?

well, when x = -1, hmm -1 is less than 0, so the subfunction that applies to that will be when "x" is less than 0, namely the part of 7x + 10, so we can say

f(-1) = 7(-1) + 10

f(-1) = 3

so hmm what's f(0) or namely, what's f(x) when x = 0?

well, what subfunction applies when x = 0? well, it has to be the subfunction with "x greater or <u>equals</u> to 0", x ⩾ 0, so then is 7x + 20

f(0) = 7(0) + 20

f(0) = 20.

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16/11 is the answer to this.

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Work out the size of angle A.<br><br> 11 cm<br> 9 cm<br> 38°
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Step-by-step explanation:

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a farmer has enough grain to feed 60 cattle for 10 days for how many days will the grain last when there are 30 cattle
azamat

Hi!

The simple explanation is just, since there are half as many cows, then the grain will last two times more.

But here's why. How many times are you going to be feeding the cattle, over 10 days, if you feed them once per day? 60 * 10 = 600, so 600 times.

If you're still feeding them once per day, and there are 30 cows instead, then find how many times 30 goes into 600. 600 / 30 = 20 days. That's a method you can use, no matter what, even if it's, say 50 cattle. You would still get an answer (if it was 50, 600 / 50 = 12, so 12 days).

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3 years ago
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In how many ways can 5 boys and 4 girls be seated on a bench so that the girls and the boys occupy alternate seats?​
Ne4ueva [31]

Answer:

2880 ways

Step-by-step explanation:

There can be only one arrangement in which boys and girls can sit.

G-B-G-B-G-B-G-B-G

but position of individual boy and girls can be changed.

So, there are 5 girls and 5 slots for them that means they can be arranged in 5! ways,

similarly boys have 4 slots, so they can be arranged in 4! ways.

now, one more thing to consider is that out of 5! arrangements of girls, with each arrangement boys can be arranged in 4! different positions.

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so the desired answer would be: 5!*4! = 120*24 = 2880 ways.

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