Answer:
Yes, y varies directly with x, and the equation is
.
Step-by-step explanation:
To check where there is a direct relationship between x and y, we need to check whether all the x,y pairs we have fit some rule:
.
For the first pair (x=4, y=6.4),

Therefore
.
For the second pair (x=7, y=11.2),

Therefore
.
For the third pair (x=10, y=16),

Therefore
.
For the second pair (x=13, y=20.8),

Therefore
.
So x does directly vary with y, and we have found out that
.
A 3x with an exponet of 3
Answer:
<em> </em>
Step-by-step explanation:
Since
is below
, you would move the decimal right
times.
That will get you to
.
Since we moved it right two times, we get a number in between
.
Scientific notation:
.
Answer:
B
Step-by-step explanation:
He can make 14 whole dumplings
Answer:
x=-1
Step-by-step explanation:
use math a way