Alock has 5 buttons. the lock is opened by pushing two buttons simultaneously and then by pushing one button alone. how many combinations are possible?

There are 5 choose 2 options for pushing two buttons simultaneously and then 5 options for pushing one button alone

5 choose 2 is 5!/(3!*2!) = 10

10*5 = 50 different combinations

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

answer: 12

step-by-step explanation: