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never [62]
3 years ago
12

The number of bricks on the bottom row was 21, and each row above it had 2 fewer

Mathematics
2 answers:
dlinn [17]3 years ago
7 0

Answer:

121

Step-by-step explanation:

21-2x

add all of the sums from 0 - 11

emmainna [20.7K]3 years ago
3 0

Answer: 121

Step-by-step explanation:

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1. If m&lt; 1 = 7x + 6 and m2 2 = 8x – 6, find the value of x so that p is<br> perpendicular to q.
Tatiana [17]

Answer:

7x + 6 =8x - 6

x= 12

Step-by-step explanation:

  1. put them equal to each other
  2. then subtract 8x from both sides
  • 7x(-8x) + 6 = 8x(-8x) - 6
  1. to get -1x
  • -1x + 6 = -6
  1. then subtract 6 from both sides
  • -1x +6(-6) = -6(-6)
  1. you'll get -1x = -12
  2. then divide -1 to both sides
  • -1x/-1 = -12/-1
  1. then you get x = 12
3 0
3 years ago
PLEASE HELP I WILL REWARD BRAINLIEST
goldfiish [28.3K]
It would be 700 cause 350 double would be equal to 700
6 0
3 years ago
Simplify.<br> -5x^4(-3x^2+4x-2)
Amiraneli [1.4K]

Answer:

3x^6 - 4x^5 + 2x^4

Step-by-step explanation:

Given

-5x^4 ( -3x^2 + 4x - 2)

Step 1 : open the bracket with -5x^4

-5x^4 * -3x^2= 15x^6

Hint: - * - = +

x^4 * x ^2 = x^ 4+2 = x^6

-5x^4 * + 4x = - 20x^5

Hint: - * + = -

x^4 * x = x^4 + 1 = x^5

(x is always raise to the power of 1 but we don't write it or less it is greater than 1 e.g. 2 , 3 ,4, ..........)

-5x^4 * -2 = 10x^4

Hint: - *- = +

Let's combine the answers

15x^6 - 20x^5 + 10x^4

We can look for a factor that can go through as in that can divide all without a reminder

Factors of

15 - 3 * 5

1 * 15

20 - 4 *5

2 *10

1 * 20

10 - 2*5

1 * 10

Since the factor of 5 is common in all, so we are using 5 to divide through

15x^6 - 20x^5 + 10x^4

Using 5 to divide through

15x^6 / 5 - 20x^5 / 5 + 10x^4 / 5

= 3x^6 - 4x^5 + 2x^4

4 0
3 years ago
What is 200 + 6d=800 what is d
Darya [45]

Answer:

100

Step-by-step explanation:

200 + 6d = 800

Subtract 200 from each side: 6d=600

Divide 6 from each side: d=100

4 0
2 years ago
Read 2 more answers
If f(x) = 3* + 10x and g(x) = 5x - 3, find (f-9)(x)
Mariulka [41]

Answer:

In the equation f(x) = 3* + 10x is the 3 squared?

If it is supposed to be squared then the answer is f(-9) = -81

If its not supposed to be squared then the answer is f(-9) = -87

Step-by-step explanation:

4 0
3 years ago
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