Which of the following does not contribute to increased air quality?

a. the clean air act
b. hybrid cars
c. use of cfcs
d. energy-efficient appliances

An earthquake’s epicenter can be determined from arrival time data recorded on a(

The ratio of the measures of the three angles in a triangle is 14: 15: 11 find the measures of the angles

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare