If 2/3 of the cards are face-up, then 2/3*12=8 cards are face-up. The remaining 12-8=4 cards are therefore face down.
Answer:

Step-by-step explanation:
We have that
, we want to find
.
We can rewrite this function with positive index to get:

We need to substitute
into the given function to get:

This implies that:

In scientific notation:

Answer:
20 - 12x = 48 answer.
Step-by-step explanation:
Multiply the whole equation by 4. Use 4 because that is the denominator of the fraction 3/4. You want to get rid of the fraction.
4(5 - 3/4 x = 12)
20 - 12x = 48
Answer:
1300
Step-by-step explanation:
object A 3.12 x 10^5 = 312000
object B 2.4 x 10^2= 240
312000/240=1300
Object A is 1300 times heavier than Object B