Question 2 of 10 Which expression would be easier to simplify if you used the associative
property to change the grouping?
OA (21 +(-14)] +(-53)
O B. 67 +[+(-3)
O C. (70 +30 + 72
OD [-12+(-5)] + 36
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The answer is C.

Step-by-step explanation:

There is an explanation in my assignments that say a good and easy way of grouping is to find a way to make 100, then add or subtract whatever is next. In this case (70+30) makes 100, then you must add 72, and because its a double diget (i cant spell, sorry!) and and so are the two zeros in the triple diget, so it should not be hard to put the two numbers together if there are zeros, (plural). I hope you understand this!

2 apples

step-by-step explanation:

taking away equals subtraction. 6-4=2

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: