Which of the sets of ordered pairs represents a function?
a = {(1, –2), (3, –5), (5, 2), (7, 5)}
b = {(4, 2), (4, –2), (9, 3), (9, –3)}

a: only a

b: only b

c: both a and b

d: neither a nor b

7x+8y=-18, 4x-9y=-3 solve the system of equations

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 23 = 10x a. -1.93, 11.93 b. 1.93, -11.93 c. 1.93, 11.93 d. -1.93, -11.93

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 (%).