What is correct?

1. the density of water is highest at 4◦c.
2. the density of water is highest at 1◦c.
3. the density of water is highest at 2◦c.
4. the density of water is highest at 3◦c.
5. the density of water is highest at 0 ◦c.
6. the density of water is highest at 5◦c.

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.