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gizmo_the_mogwai [7]
4 years ago
10

Can someone help me please I don't understand

Mathematics
1 answer:
iVinArrow [24]4 years ago
7 0
The formula for surface area are 2(LW+LH+WH). If the numbers were being placed in the formula, it will become 2[(9*7)+(9*12)+(12*7)]. 9*7 is 63, 9*12 is 108, 12*7 is 84 and the sum will be 255, and multiply by 2 is 510.
The answer is 510
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Together, a house and the lot it is on costs $40,000. If the house costs seven times as much as the lot, how much does the lot c
padilas [110]

The lot costs 5000 dollars.

<u>Step-by-step explanation:</u>

The cost of a House and the lot = $40,000.

Let us assume the cost of lot as 'x'

Given that, The cost of the house is 7 times as much as the lot.

Therefore, The cost of the house= 7x

The cost of both the house and the lot= x + 7x

$40,000 = x + 7x

40,000 = 8x

x = 40,000/8

x = 5,000

The lot costs $5000.

4 0
4 years ago
Can someone help me please
Taya2010 [7]

Answer:

n = -1

Step-by-step explanation:

n^2 + 5n + 1 = 3n

N^2 +2n +1 = 0       (subtract 3n from both sides)

(n+1)(n+1) = 0   (factor

n+1 =0; n= -1

n+1 = 0  ; n=-1

4 0
3 years ago
At the beginning of the month, Leona's checking account had $2,344.98 in it. Since then, she has written checks for $525.00, $33
TiliK225 [7]
Should would have $1,642.86 in her account 
3 0
3 years ago
Factor cot^2x-cotx-42
tankabanditka [31]

Step-by-step explanation:

cot²x − cot x − 42

(cot x − 7) (cot x + 6)

3 0
3 years ago
Which of the following is an even function?
12345 [234]

Answer:

  • B. g(x) = 2x² + 1

Step-by-step explanation:

<u>Even function has following property:</u>

  • g(x) = g(-x)

<u>It is easy to show this works with the second choice only. All the others don't work:</u>

  • g(x) = (x - 1)² + 1
  • g(-x) = (-x - 1)² + 1

This is not correct as x - 1 ≠ -x - 1 so as their squares, so g(x) ≠ g(-x)

The last two choices are not even similarly.

6 0
3 years ago
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