Answer:
i belive it is the 3rd on
Step-by-step explanation:
sorry if wrong
Answer: Multiply the top equation by , multiply 3 the bottom equation by 2, then add the equations.
Step-by-step explanation:
6x - 15y = 39
+ (- 6x + 4y) + (26)
- 11y = 65
Answer:
750
Step-by-step explanation:
62.5% choose chocolate
1200 x 62.5% of is 750
Martha squeezes 5 oranges to make juice. If she already has 3/5 liters of juice, how many times does she need to fill a container that has 9/10 capacity?
According to the problem, with 5 oranges Martha has
litters of orange juice.
First we have to find <u>how many litters are needed to reach the
litters capacity of the container</u>. This can be mathematically expressed as follows:
Let’s find X:
This means that <u>Martha needs
to reach the
capacity</u>.
Now, if 5 oranges represent
, how many oranges represent
?
This can be solved by “the rule of three” also called cross-multiplication:
5 oranges--------
N oranges--------
This is equivalent to
This means Martha needs 2.5 oranges or
to to fill a container that has 9/10 capacity.
You can use a graphing calculator, or you can replace sin^2 by 1-cos^2 and solve the quadratic.
.. (1-cos^2) -cos^2 = 1 -cos
.. -2cos^2 = -cos
.. cos(2cos -1) = 0
The zero-product rule tells you
.. cos = 0 . . . . . . angle = π/2 +kπ
.. cos = 1/2 . . . . . angle = ±π/3 +2kπ