Answer:
- The system of equations is x + y = 85 and 7/20x+2/5y=31
- To eliminate the x-variable from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7.
- B-She used 60 minutes for calling and 25 minutes for data.
Step-by-step explanation:
It is always a good idea to start by defining variables in such a problem. Here, we can let x represent the number of calling minutes, and y represent the number of data minutes. The the total number of minutes used is ...
x + y = 85
The total of charges is the sum of the products of charge per minute and minutes used:
7/20x + 2/5y = 31.00
We can eliminate the x-variable in these equations by multiplying the first by -7 and the second by 20, then adding the result.
-7(x +y) +20(7/20x +2/5y) = -7(85) +20(31)
-7x -7y +7x +8y = -595 +620 . . . . eliminate parentheses
y = 25 . . . . . . . . simplify
Then the value of x is
x = 85 -y = 85 -25
x = 60
That would be a 120 Square Feet.
Use the length of one side of the ceiling, which is 12, and then use the other side that is 10. The ten feet comes from the floor. think of it in 2-Dimensional
Answer:
12
Step-by-step explanation:
2, the digit in the ones place is double 1, the digit in the tens place. 2 + 1 = 3.
Hope this helps!
So as your given angle 4. angle 5 and angle 5 are alternate angles! so from that angle 4=5
and angle 7 equals angle 6 due to opposite angles!
so if it's given that angle 4 is equal to 7
and we found out that 4=5 6=7
we can definitely 5=6
Answer:
exact form: 23/15
decimal form: 1.5333333333 (infinitely or add a little line on top of the 3)
mixed number form: 1 8/15
Step-by-step explanation: