Will give brainest to the person who answers right

the revenue from selling x shirts is r(x) = 15x.

the cost of buying x shirts is c(x) = 7x + 20.

the profit from selling x shirts is p(x) = r(x) – c(x).

what is p(x)?

a. p(x) = 22x – 20
b. p(x) = 22x + 20
c. p(x) = 8x – 20
d. p(x) = 8x + 20

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? round your answer to the nearest tenth. s how far will the football travel before it lands? round your answer to the nearest tenth. m

Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29×10 to the power of −11 m, the expected position of the electron in the atom.