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Katyanochek1 [597]
3 years ago
11

Please show your work

Mathematics
1 answer:
Andrei [34K]3 years ago
5 0

Answer:

a = 9

Step-by-step explanation:

a^2 = 41^2 - 40^2

a^2 = 1681-1600 = 81

a = 9

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Yo im not good at this stuff, can someone help me?​
Kazeer [188]

Answer:

  21 kWh

Step-by-step explanation:

1. Subtract 25% from the original amount.

  25% of 28 kWh is ...

  0.25 × 28 kWh = 7.00 kWh

Subtracting this from 28 kWh, we find the usage after reduction to be ...

  28 kWh - 7 kWh = 21 kWh

__

2. We know that if we reduce 100% of a quantity by 25%, then the resulting amount is (100 -25)% = 75% of the original. As a fraction, this is 75/100 = 3/4 of the original amount. Then the reduced usage is ...

  (3/4) × (28 kWh) = 3·(7·4)/4 kWh = 3·7 kWh = 21 kWh

__

Mario must reduce his usage to 21 kWh or less.

7 0
2 years ago
Solve the following system of equations.
Lerok [7]

Answer:

x=5 and y=-2

Step-by-step explanation:

3x+5y=5

-(7x+5y=25)

-4x=-20

x=5

plug 5 into one of the equations. 3(5)+5y=5

y= -2

3 0
2 years ago
Mariah build a tabletop using square tiles there are 12 rows of tiles and 30 tiles in each row how many tiles does Maria use
Stells [14]

30 \times 12 = 360
360 because 30×12=360 so it would be 360 b
6 0
3 years ago
Find the solution for y=2x-1 y=3x+2
ziro4ka [17]
ANSWER: (-3,-7)
Set them equal to each other so, 2x-1=3x+2 to find x. You should get x= -3


Then you plug in -3 for x to find Y for either y=2x-1 or y=3x+2. I’m picking y=3x+2 so when you plug in -3 to x it will be y=3(-3)+2 = -7 . So therefore y=-7




6 0
3 years ago
⚠️I mark brainlist⚠️What is the simplified value of the exponential expression 16^1/4 ?
Ivan

Answer:

2

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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