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marta [7]
3 years ago
6

Phân tích thành thừa số a) 2√46 + √69b) x√x - y√yc) x-2+√x^2-4

Mathematics
1 answer:
const2013 [10]3 years ago
4 0
Need help to with that qustion
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Karina uses the system of equations below to compare the monthly utility costs in July and December for electricity, x, and natu
fiasKO [112]

Answer:

d. The cost of natural gas (y) = $0.83 per unit

Step-by-step explanation:

The explanation is shown below:-

the equation of system is:

750x + 17y = 141.61  (i)        

300x + 30y =75.90 (ii)

as x indicates the cost of electricity and y indicates the costs of natural gas.

we will solve the both equation with the help of multiplication for (i) by 30 and for (ii) 75

30\times (750x  + 17y) 30\times 141.61\\\\

after solve the above equation we will get

22,500x + 510y = 4248.3 (iii)

75\times (330x + 30y) = 75\times 75.90

after solve the above equation we will get

22500x + 2250y = 5692.5 (iv)

After deducting the equation (iii) and (iv) we will get

1740 y = 1444.2

After Dividing by 15 both sides,

116y = 96.28

So, Katrina simplify the above system using linear equation and reach at the equation that is

116 y = 96.28

By Division property of equality defines that divide the equal no. of both sides of an equation:

by  Division of 116 to both sides of an equation, to get y:

\frac{116y}{116} = \frac{96.28}{116}

y = 0.83

So, the natural gas is $0.83 per unit

7 0
3 years ago
Every day you travel 4 3/4 miles each way to get to school. How many miles do you travel all together to get to and from school
Artyom0805 [142]

Answer:

47.5 miles

Step-by-step explanation:

So, every morning, you travel 4.75 miles to get to school... and another 4.75 miles in the afternoon to return.

So, each day, you travel a total of 9.5 miles (4.75 + 4.75) to go school and back.

On a typical school week, you'll go to school 5 times... so you'll need to travel a total of 47.5 miles (5 * 9.5).

5 0
3 years ago
PLEASE HELP !!!!
prohojiy [21]

Answer:

{(-2, 5), (1, -1), (2, -2), (5, 2)}

4 0
2 years ago
PLEASE HELP! THANK YOU!<br><br> Explain your answer!!!
Brrunno [24]

Answer:

1) y = 1/2 x + 3 and y = 1/2 x  are parallel

2) y = 1/2 x + 4   and   y = 1/2 x + 1  are parallel

Step-by-step explanation:

Two lines are parallel only if their slope is equal.

1)

In the first problem:

y = 1/2 x + 3 and y = 1/2 x have same slope ( i.e slope = 1/2)

That means these two equations are parallel to each other.

2)

In the second problem:

y = 1/2 x + 4   and   y = 1/2 x + 1 have same slope( i.e slope = 1/2)

Hence above two equations are parallel to each other.

6 0
3 years ago
The probability density function of the time to failure of an electronic component in a copier (in hours) is f(x) e^-x/1074 /107
love history [14]
Can u add the picture please?? If u don’t mind
4 0
2 years ago
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