Find the value of:
a) 5x when x = 6
b) 3y when y = -7
c) 10z when z = 0.8

a) 30

b) -21

c) 8

Step-by-step explanation:

a) 5×6

b) 3×-7

c) 10×0,8

isi

step-by-step explanation:

use that smart brain

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours