Eleanor practiced playing his violin for 12 minutes. he has practiced 40% of the amount of time he needs to practice today how many more minutes does eleanor need to practice today?

18 mins

Step-by-step explanation:

if 12mins is 40%

then add 12mins again

12+12=24

so 24 is 80%

then divide 12 by 2 and add it to 24

12/2=6

24+6=30

eleanor practiced 30 mins with his violin per day

he has practiced 12 mins out of 30mins

so he has 18 mins more to practice

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!