An average is written by the values / the amount of values.
We know there are 3 values, we know the numbers of 2, this can be modelled by the equation:
(78 + 85 + x)/3 = 85
We solve that ^:
(163+x)/3=85
163+x=255
x=92
The score on her 3rd test is 92
Answer:
24 Sorry its a bit mesy on computer haha.
Step-by-step explanation:
24
3 / 72
---------
-6
----------
1 2
-12
Answer:
x =2.2 y= 12
Step-by-step explanation:
Add the two equations 5x-5x is zero
_y +3y =24
-1+25=24
so the equation becomes 2y=24
y=12
5x-12=-1
5x=-1+12
5X=11
so x = 2.2 y =12
Answer:
x=1
Step-by-step explanation:
3/2+1/2x=2x
or,3*1+1*1x/2=2x
or,4x/2=2x
or,4x-2x=2
or,x=2/2
so,x=1
C. m∠x=90-40=50°
m∠y=180-55=125°