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3 years ago

PLZ HELP HELP HELP HELP HELP

Mathematics

2 answers:

Bond [772]3 years ago

7 0

Answer:

(X - 3)*2

(X + 7)*5

(10 * X) + 20

Step-by-step explanation:

I used X as a replacement for "A number"

Hope this helped a bit

Ronch [10]3 years ago

7 0

Answer:

1. (n - 3) x 2 or n - 3 x 2

2 . (n + 7) x 5 or n + 7 x 5

3 . (10n) + 20 or 10n + 20

Step-by-step explanation:

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It's moving day, and Lydia has packed her books into large and small boxes. The large boxes hold 35 books, and the small ones ho

Virty [35]

The number of large boxes is 4 and the number of small boxes is 14.

Explanation

Suppose, the number of large boxes is $x$ and the number of small boxes is $y$

As, the total number of boxes is 18, so the first equation is....

$x+y= 18 .......................................(1)$

The large boxes hold 35 books, and the small ones hold 20 books and the total number of books is 420. So the second equation will be .....

$35x+20y=420................................(2)$

Now solving equation (1) for $y$ itself , we will get....

$y= 18-x$

We will plug this $y= 18-x$ into equation (2). So.....

$35x+20(18-x)=420\\ \\ 35x+360-20x=420\\ \\ 15x= 420-360\\ \\ 15x=60\\ \\ x= \frac{60}{15}=4$

Now plugging this $x=4$ into the equation $y= 18-x$ .......

$y= 18-4= 14$

Thus, the number of large boxes is 4 and the number of small boxes is 14.

3 0

3 years ago

Divide x to the 1 half power divided by x to the 2 sevenths power.

Semenov [28]

Remember some basic rules
$\frac{x^m}{x^n}=x^{m-n}$
and
$x^ \frac{m}{n}= \sqrt[n]{x^m}$

so
$\frac{x^\frac{1}{2}}{x^\frac{2}{7}}=x^{\frac{1}{2}-\frac{2}{7}}$
1/2-2/7=
7/14-4/14=
3/14

$x^{\frac{1}{2}-\frac{2}{7}}=x^{\frac{3}{14}}$

$x^ \frac{3}{14}= \sqrt[14]{x^3}$

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3 years ago

11 The 7th term of Ap is 27 and the 12th term is 47.what is the sequence

inessss [21]

Answer:

3, 7, 11, 15, 19, 23, 27,.......

Step-by-step explanation:

Let the first term and the common difference of the AP be a and d respectively.

$a_7 = 27 .....(given)$