Answer:
B(12)
Step-by-step explanation:
Constant of proportionality is basically the slope.
Slope = Δy/Δx
here y= distance travelled and x= number of hours
so slope = 36-3/3-0.25= 33/2.75 = 12
Answer:
8
Step-by-step explanation:
so the top would equal 250000 and the bottom part of this equation would equal 125000. So you'd do 250000/125000 = 2. After that you would do 2 x 2 x 2 which gives you 8.
The best way to multiply complicated problems mentally* is to break them into chunks.
Start with 20 times 8 to get 160, and then 8 times 5 to get 40. Add these together to get 200. 200 times 3 is 600, and 20 times 200 is 4000. Add these together to get your final answer, 4600.
In other words 8 x 20 + 8 x 5 = 200 200 x 3 + 200 x 20 = 4600
*I assumed you meant mentally, because otherwise you'd just multiply longhand, multiplying two of the three numbers and then multiplying their product with the third.