Answer:
-28r - 28
Step-by-step explanation:
-4 * 7 = -28.
Therefore, -28r - 28 is the new equation. It can' be simplified any further
Answer:i think its 15 because if you take the km numbers and subtract them
Step-by-step explanation:
Answer: It should be 825
Step-by-step explanation:
The <em>correct answers</em> are:
Top circle: 34
Bottom left: 9
Bottom right: 21
Explanation:
Let the top circle be x, let the bottom left circle be y, and the bottom right circle be z.
Following the diagram, we have the following equaitons:
x+y = 43
y+z = 30
x+z = 55
Taking the first two equations as a system, we will eliminate y:
We will subtract the bottom equation from the top:
We will now take this and the last equation as a system; this time, we will eliminate z by adding the two equations:
Divide each side by 2:
2x/2 = 68/2
x = 34
Substitute this into the first equation:
x+y = 43
34+y = 43
Subtract 34 from each side:
34+y-34 = 43-34
y = 9
Substitute this into the second equation:
y+z = 30
9+z = 30
Subtract 9 from each side:
9+z-9 = 30-9
z = 21
210 ÷ 6 = 35 miles to the gallon
280 ÷ 35 = 8 gallons for 280 miles