Which statement describes the system of equation?
{-5x - 4y = -4
{25x + 20y = 20
a. it has one solution (4, -4).
b. it has one solution (8, -9).
c. the system has no solution.
d. the system has infinitely solutions.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).

On monday, the water was shut off 3 times for 1/4 hours, 2/3 hours, and 1-3/4 hours, respectively. what was the tireless number of hours the water was off?