Answer:

Step-by-step explanation:
we know that
The formula of law of cosines is equal to

where
a, b and c are sides. C is the angle opposite side c
In this problem we have

substitute the given values






Answer:
17. See below
18. 750
Step-by-step explanation:
17. Since the lollipops are being sold at the same price, 50 cents, for each one sold, they make a constant amount of money. For each increase in lollipops sold, there is a constant increase in money made, and thus the situation is a linear function.
18. To solve this equation, let's say y is the money made at the convention in dollars and x is the number of lollipops sold. If the principal gave them 125 dollars before they sold any lollipops (0 lollipops sold), then 125 is the y-intercept of the function, and in the equation y=mx+b, b=125. If each lollipop costs 50 cents (half of a dollar), then for each lollipop, x, sold, .5 dollars are made and are added to the profit, y. Thus, .5 dollars is the slope. The equation then becomes:

Now, if they need 500 dollars, y is thus equal to 500 dollars. Solving the equation:






Thus, 750 lollipops must be sold.
The number of ounces of jam that each jar can hold is 4 large jars and 2 small jars.
<h3>What is Matrix?</h3>
A matrix is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns, which is used to represent a mathematical object or a property of such an object.
Here, from the given matrix by comparing the equations, we have:
l + 2s = 8 ...........(i)
l - s = 2 .............(ii)
Subtract the second equation from the first, to eliminate l
3s = 6
s = 2
Substitute 2 for s in l - s = 2
l - 2 = 2
Add 2 to both sides
l = 4
Thus, the number of ounces of jam that each jar can hold is 4 large jars and 2 small jars.
Learn more about matrix from:
brainly.com/question/11989522
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Answer:
B
Step-by-step explanation:

I hope I helped you.