3. how many solutions does the system have? }
sy = x2 + 4x – 2
1 y = 2x+1

Hence two solution of expression

I.e x= 1 , - 3

Step-by-step explanation:

Given as :

y = x² + 4 x - 2

And y = 2 x + 1

Solving these equation

x² + 4 x - 2 = 2 x + 1

or, x² + 4 x - 2  - 2 x -  1 = 0

Or, x² + 2 x - 3 = 0

Or,  x² + 3 x - x - 3 = 0

Or, x ( x + 3 ) -1 ( x + 3 )= 0

Or, ( x + 3 ) ( x - 1 ) = 0

or, x = - 3  And x = 1

Hence two solution of expression Answer

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.