For the graph below, what should the domain be so that the function is at least 300?

a.) x≥0
b.) -5≤x≤30
c.) 0≤x≤25
d.) all real numbers

Option C. 0≤x≤25

Step-by-step explanation:

we know that

The function f(x) of the graph is a vertical parabola open down

If the function is at least 300

then

The solution is the shaded area above the solid line f(x)=300

In the graph plot f(x)=300 and find the value of x

The values of x are

see the attached figure

therefore

The interval is ------> [0,25]

All real numbers greater than or equal to zero and less than or equal to 25

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

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.