Answer:
(3x - 7y)(3x + 7y)
Step-by-step explanation:
9x² - 49y² ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
here 9x² = (3x)² ⇒ a = 3x and 49y² = (7y) ⇒ b = 7y
9x² - 49y²
= (3x)² - (7y)² = (3x - 7y)(3x + 7y)
Answer:
Step-by-step explanation:
We are given the following in the question:
where p gives the profit.
We want to keep the profit positive, thus
Thus, x should lie between 40 and 110 so that the profit is always positive.
Answer:
B
Step-by-step explanation:
In slope intercept form, y = mx + b, the m is the slope, the b is the y intercept, and x and y can be subbed in from the point you are given of (1, 3). We are told the slope, so everything we have fills in like this:
Now we just need to solve for b:
and
so
Answer:
≥
Step-by-step explanation:
First, let me clarify what the inequality expressions are and what they signify.
≥ means greater than or equal too
≤ means less than or equal too
< means less than
> means greater than
The text says students in middle school must be 10 years <em>or older. </em>That gives me a clue that students in middle must be either 10 years old, or older than ten years old. Greater than 10, or equal to ten. The inequality symbol that compliments that is the greater than or equal to symbol, ≥. So, the inequality symbol that goes with the text is the greater than or equal to sign, ≥.
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