Well, for 20 you just add them, to get

. For 21, you do a substraction:

. It'd take him quite some time (does this one even have zeros? :)) )
I think it would be 2.5 since it is asking the opposite of -2.5 on a number line so then it into a positive
Answer:
1×24. 1×18
2×12. 2×9
3×8. 3×6
4×6
Step-by-step explanation:
Here is a little thing to help you remember.Factors are the numbers that you multiply to get the product.
To ease the understanding, let's write it in degrees and not in Radian:
Formula of conversion: Degree°/180 = Radian/π
Convert 7π/4 in degrees: = (7x180)/4 = 315°
This angle is in the IV th Quadrant of the UNIT circle. So you can write 315° or - 45° .
sin(7π/4) = sin(315°) = sin( - 45°) = - sin(45°) = - (√2)/2
Answer:
C
Step-by-step explanation:
since it is a line segment it is only that portion of a line, so its s, t and all in between