naomihiggins4033
05.01.2021 •
Mathematics
Help please
Evaluate -9 - (-4)
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Ответ:
The answer should be -5.
Step-by-step explanation:
Remember that if there are two negative signs next to each other then it will turn into a positive sign, in which you get the equation -9 + 4. Your answer should be -5 when you add 4 from -9.
Ответ:
step-by-step explanation:
it s given that and .
also, we know that and , therefore
hypotenuse=8, base=t and perpendicular=s.
now, using trigonometery, we have
substituting the given values, we have
which is the required value of cosy.