Use cosine law to solve the problem. See image attached.
What we're looking for is the length of side A (a side which is opposite with angle A).
This is the formula of cosine law
A² = B² + C² - 2BC cos A
Input the numbers
A² = 75² + 90² - 2(75)(90) cos 85°
A =
A =
Answer:
x = -2
Step-by-step explanation:
First, distribute the -14(x+6).
x-5 = 49-14(x+6)
x-5 = 49-14x-84
Next, add up all the like terms (49+(-84))
x-5 = 49-14x-84
x-5 = -14x-35
Now, bring all the like terms to one side. All the x's to one side and all the numbers to the other side.
x-5 = -14x-35
x+14x = -35+5
15x = -30
Last, get x by itself.
15x = -30
x = -2
Well, the way you wrote it ... 22/7 ... it's not a decimal at all.
It's an improper fraction. But I understand what you mean.
Remember ... a fraction is a short way to write a division problem.
Whenever you see a fraction, it means
(the top number) divided by (the bottom number) .
If you take your pencil and paper, or your calculator, and do
the division '22' divided by '7' ... very easy to do; you really
should have done it on your own ... you get
3.142857...
That group after the decimal point ... the " 142857 " ... does
repeat forever. So 22/7 does produce a repeating decimal.
Answer:
D.
Step-by-step explanation:
We have been given 4 expressions. We are asked to choose a trinomial with a leading coefficient of 3 and a constant term of -5.
Let us check our given choices one by one.
A.
Upon looking at our expression, we can see that leading coefficient is and constant term is 3, therefore, option A is not a correct choice.
B.
Upon looking at our expression, we can see that leading coefficient is 3 and constant term is . But we can see that this expression is not a trinomial as it has only two terms, therefore, option B is not a correct choice.
C.
Upon looking at our expression, we can see that leading coefficient is 3 and constant term is 1 . Therefore, option C is not a correct choice.
D.
Upon looking at our expression, we can see that leading coefficient is 3 and constant term is and expression has three terms. Therefore, option D is the correct choice.
The last expression: (16-8)x2+4=8x6=48