Write an equation and solve for the missing value show your work

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?