Answer:
(-1)^4 = 1
Because negative 1 raised to an even exponent results in a positive number.
18.9
Step-by-step explanation:
21+(-3)-(-0.9) = 21-3+0.9 = 18+0.9 = 18.9
B
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9
cos(68°)×24= 8.99 which can be rounded to 9