Determinativaloarea expresiei a. x = - 3, y= -7, z = -12 b. x = 9, y =12, z = - 8 c. x = - 21, y = - 6 , z =17 .

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.