If I had some pennies, nickels, dimes, and quarters in my pocket. When I reached in and pulled out some change, I had less than coins whose value was 42 cents. What are all the possibilities for the coins I had in my hand

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?