The function f(t) = 7 cos(pi over 4t) + 12 represents the tide in light sea. it has a maximum of 19 feet when time (t) is 0 and a minimum of 5 feet. the sea repeats this cycle every 8 hours. after two hours, how high is the tide?

Atennis racket at sport city costs $180 and is discounted 15%. the same model racket costs $200 at tennis world and is on sale for 20% off. which store is offering the better deal? explain:

The correlation between height and weight for a certain breed of plant is found to be 0.75. what percentage of the variability in plant weight is not explained by height? 1-0.75 = 0.25 or 25% (b) )^2 = 0.5625 or 56.25% (c) )^2 = 0.4375 or 43.75% (d) (1 - 0.75)^2 = 0.0625 or 6.25%

Ineed to know the two degrees asap .