ravenjade2395
05.03.2021 •
Mathematics
Does anyone know this? If you do can you please help me?
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Answers on questions: Mathematics
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Ответ:
Step-by-step explanation:
A product is formed by multiplying the factors. Here, you want the product of -2 and x, so that is indicated as ...
-2x
You want that product greater than 30. The symbol for "greater than" is >, so you have ...
-2x > 30 . . . . the desired inequality
__
The most straightforward way to solve this is to divide by the coefficient of x. Because that is negative, you must reverse the inequality symbol from "greater than" to "less than."
x < 30/(-2)
x < -15 . . . . . . the desired solution
Additional comment
It may not be clear why multiplying or dividing an inequality causes the symbol to be reversed. You can think of it as reflecting the inequality over the point x=0 on the number line. Where larger numbers were on the right, they get reflected to points farther left, so as negative numbers, they are smaller numbers.
Consider ...
1 < 2
-1 > -2
Ответ:
The answer is B
Step-by-step explanation:
The answer is B, because any triangle that has an angle that measures more than 90 degrees is obtuse. If the angle measures lower than 90 degrees it is acute. In this case, it would be obtuse, because it is over 90 degrees instead of under 90 degrees.