85% of 920
85% * 920
85/100 * 920
0.85 * 920
doing work . . .
782
Answer : 782
*Hope that helps :)*
Answer:
x = -9 x = 1/4
Step-by-step explanation:
(x+9)(4x-1)=0
Using the zero product property
x+9=0 4x-1=0
x= -9 4x =1
x = 1/4
"The sum of two numbers is 20" can be translated mathematically into the equation:
x + y = 20.
"... and their difference is 10" can be translated mathematically as:
x - y = 10
We can now find the two unknown numbers, x and y, because we now have a system of two equations in two unknowns, x and y. We'll use the Addition-Subtraction Method, also know as the Elimination Method, to solve this system of equations for x and y by first eliminating one of the variables, y, by adding the second equation to the first equation to get a third equation in just one unknown, x, as follows:
Adding the two equations will eliminate the variable y:
x + y = 20
x - y = 10
-----------
2x + 0 = 30
2x = 30
(2x)/2 = 30/2
(2/2)x = 15
(1)x = 15
x = 15
Now, substitute x = 15 back into one of the two original equations. Let's use the equation showing the sum of x and y as follows (Note: We could have used the other equation instead):
x + y = 20
15 + y = 20
15 - 15 + y = 20 - 15
0 + y = 5
y = 5
CHECK:
In order for x = 15 and y = 5 to be the solution to our original system of two linear equations in two unknowns, x and y, this pair of numbers must satisfy BOTH equations as follows:
x + y = 20 x - y = 10
15 + 5 = 20 15 - 5 = 10
20 = 20 10 = 10
Therefore, x = 15 and y = 5 is indeed the solution to our original system of two linear equations in two unknowns, x and y, and the product of the two numbers x = 15 and y = 5 is:
xy = 15(5)
xy = 75
Problems a through c are asking you what the values would be at those values.
What will the value of 
be at 
? Let's look at the graph.
It seems at , 
, meaning that 
Let's do the same for the others.
At 
, 
At 
, 
For the last question, it is giving us the value and asking us which 
values would give us that.
At 
, 
.
*Note* this function is continuous to the right, meaning that there is another point where .
Hope this helps.
頑張って!
6231+2787= 9018
Which rounds off to 1000 if they want you to do it to the nearest thousand
