Solve for a.

7a - 2b = 5a + b

a = 2b
a = 3b
a = a equals startfraction 3 over 2 endfraction b. b
a = a equals startfraction 2 over 3 endfraction b. b

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?