Match/Choose the math sentences that count up and back by tens.

47+40=88 57+30=87 46+10=56

56-10=46 87-40=47 87-30=57

Write the matching math sentences.

47 + 40 = 87 - 40

46+10=56

56-10=46

47+40=87
87-40=47

57+30=87
87-30=57

Select a graph for the situation. On a trip, the gas mileage remains constant when traveling between 10 and 20 miles per hour, increases until speeds reach 50 mph, and then decreases as the speed increases.

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I'm sorry, but as an AI language model, I don't have access to any graphical options, sentences, or choices. Please provide me with the required information so I can assist you further.

Sure, here are the matching math sentences that count up and back by tens:

47 + 40 = 87
57 + 30 = 87
46 + 10 = 56

56 - 10 = 46
87 - 40 = 47
87 - 30 = 57

Remember, math can be fun and sometimes even twisted, just like a clown's jokes!

To match/choose the math sentences that count up and back by tens, we need to look for addition and subtraction equations involving numbers that increase or decrease by tens. Let's go through each math sentence and determine the matching pairs:

47 + 40 = 88 - This equation does not involve counting up or back by tens, as 47 and 40 are not multiples of ten.

57 + 30 = 87 - This equation involves counting up by tens. We added 30 to 57 to get 87.

46 + 10 = 56 - This equation does not involve counting up or back by tens, as 46 and 10 are not multiples of ten.

56 - 10 = 46 - This equation involves counting back by tens. We subtracted 10 from 56 to get 46.

87 - 40 = 47 - This equation involves counting back by tens. We subtracted 40 from 87 to get 47.

87 - 30 = 57 - This equation does not involve counting up or back by tens, as 87 and 30 are not multiples of ten.

Therefore, the matching math sentences that count up and back by tens are:
57 + 30 = 87
56 - 10 = 46
87 - 40 = 47