Function f gives the temperature in degree Celsius, t hours after midnight. Use function notation to write an equation for each statement. a. The temp at 12 p. m.
b. The temp was the same at 9 a. m. and 4 p. m.
c. It was warmer at 9 a. m. than 4 p. m.

Find the value of x for which the lines are parallel.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.