B. The square root of the difference between p and q where p>q

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?