All categories

3 years ago

7 times a number is 18 less than the square of that number. Find the positive solution.

1 answer:

7 0

So 7 x = x2 -18 so you get the quadratic x^2 -7x -18 and then get 2 x -9= -18 and 2 + -9 = -7 so you get (x + 2) ( x - 9) so the positive solution would be x-9 = 0 so x= 9. Hope this helps :)

You might be interested in

How do we solve this problem?

MaRussiya [10]

To solve the problem you must find the area of every square. For F one of the squares has a side length of 3 and because this is a square the other sides are also 3. To find the area we multiply two of the sides so 3 times 3 is 9
You do this with both the other squares
3*3=9
4*4=16
The area of the large square is given as 25
So 9+16=25 which means this is not the correct answer

H.
9*9=81
Given as 144
The area of the large square is 21*21 which is 441
144+81= 225
So because the two small squares DO NOT equal the area of the large square this is the correct answer.

5 0

2 years ago

Literally putting this at 45 points. can someone help me please

sergiy2304 [10]

Answer:

15.4%

Step-by-step explanation:

Volume of a cylinder:

V = πr²h

Container A

r = 10 ft, h = 11 ft
V = π*10²*11 = 1100π ft

Container B

r = 7 ft, h = 19 ft
V = π*7²*19 = 931π ft²

After pump out the container A has the level of:

1100π - 931π = 169π

Level % in the container A:

169π/1100π×100% = 15.4% rounded to the nearest tenth

4 0

2 years ago

4 tons of sand cost $6,240.00. What is the price per pound?

Vsevolod [243]

Answer:$0.78

Step-by-step explanation:

3 0

8 months ago

Brandon drew a scale drawing of a hotel. a room in the hotel is 18 inches wide in the drawing. the actual room is 12 feet wide,

Contact [7]

3inches=1 1/2 feet I believe but I'm not to sure about it you will have to the math this is just my answer to you guys sorry if its wrong at least I tried

3 0

3 years ago

An arithmetic sequence has this recursive formula:

ankoles [38]

Hello!

The recursive rule for an arithmetic sequence: $a_{n} = a_{n-1} + d$ .

The explicit rule for an arithmetic sequence: $a_{n}=a_{1} +d(n-1)$ .

$a_{n}$ is the value you are trying to find, or simply the answer. :)

$d$ is the common difference of the sequence.

$a_{1}$ is the first term of the sequence.

Given, $a_{1} = 8$ and $a_{n}=a_{n-1} - 6$ ...

The common difference is -6, and the first term is 8.

Plug these values into the explicit rule for an arithmetic sequence, you get:

$a_{n}=8+(-6)(n-1)$ .

Therefore, the answer is A, $a_{n}=8+(n-1)(-6)$ .

If you wondered why, $a_{n}=8+(-6)(n-1)$ is equal to $a_{n}=8+(n-1)(-6)$ , the Commutative Property of Multiplication states that when two numbers are multiplied together, the answer is the same regardless of the order of the numbers, which makes $a_{n}=8+(-6)(n-1)$ and $a_{n}=8+(n-1)(-6)$ equal to each other.

4 0

3 years ago

Read 2 more answers