If x varies directly as y, and x=12 when y=3, find x when y=7

Answer:

69 and 70

Step-by-step explanation:

69 + 70 = 139

69 and 70 are consecutive numbers that add up to 139.

Find the difference between the 2 numbers which will give you the increase from the lower value to the higher.  Divide this increase by the original (lower) number and multiply the result by 100 to get the percentage.  For us that looks like this:  .  Simplifying a bit we have  or 49%, rounded.

Answer:

c=2

Step-by-step explanation:

7-4c=3c-7

7+7=3c+4c

14=7c

Dividing both sides by 7

c=2

CHECK:

Putting c in the above equation

7-4(2)=3(2)-7

7-8=6-7

-1=-1

Hence the above solution satisfies the given equation

Answer:

5

Step-by-step explanation:

4 x 2 - 3 =

8 - 3 =

5

So the time that he slept until on Saturday was 10:30a.m