180 - 46 - 24 = 110
d+ 80 = 110
d = 30
answer
d = 30
Answer:
$120
Step-by-step explanation:
✓An expression for this can be written as
f(n) = 20(n)
Where n= number of weeks of the lesson.
✓Then the cost for 6 weeks of lessons will be f(6)
f(6) = 20(6)
=$120
Hence, The cost is $120
Answer: x=-2
Y= -20
Step-by-step explanation
You replace the y in the second equation with 10x. This is because it says 10x=y
2x+10x=12x so you put that
12x=-24
To get x by its self you divide by 12.
-24 divided by 12 is -2.
Now you plug in -2 to either equation as y. I chose the first one because it's easier.
10(-2)=y
-20=y
All you have to do to calculate the mean average is add the values of the numbers together and then divide that sum by the number of numbers :D.
So in this case:
766 + 878 = 1644
1644 / 2 = 822
The average of these two numbers is 822.