If 14 g of a radioactive substance are present initially and 3 years later only 7 g remain, how much of the substance will be present after 7 yr?

1. what is the measure of ∠abc? what is the measure of ∠abd?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50

Ithink i know it but i want to be sure so can you me out ?