An expression is show. (4*10^-5) + (2*10^-5)  / (3*`10^7) which expression is equivalent? (show steps) a. 2*10^-17 b. 2*10^-12 c. 2*10^-2 d. 2*10^12 i'm really confused on how to solve it so can you put steps and : )

Which description is represented by a discrete graph? kiley bought a platter for $19 and several matching bowls that were $8 each. what is the total cost before tax? the temperature at 9 a.m. was 83° f and is heating up at an average rate of 6°f per hour. what is the temperature x hours later? juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. what is the total amount of calories he consumed? a bottle contained 2,000 ml of liquid and is being poured out at an average rate of 300 ml per second. how much liquid is left in the bottle after x seconds?