The surface area of which composite figure is the sum of the areas of eight triangular faces? two rectangular pyramids joined at their congruent bases
two rectangular pyramids joined at two congruent lateral faces
two triangular prisms joined at their congruent bases
two triangular prisms joined at two congruent lateral faces

In a coastal town, the humidity, measured in grams of water per kilogram of air, increases by 43% for every 1 degree celsius increase in temperature. a scientist observes that the humidity on monday morning is 5.75 grams per kilogram. he wants to know how much the temperature must increase for the humidity to reach at least 49.17 grams per kilogram. let t represent the increase in temperature, in degrees celsius, from monday morning's observation. write an inequality to represent the situation, and use it to determine the desired temperature increase.