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Paraphin [41]
3 years ago
8

90 PTS HELP

Mathematics
2 answers:
steposvetlana [31]3 years ago
6 0

Answer:A

Step-by-step explanation: I took the test

nadya68 [22]3 years ago
3 0

Answer:

\frac{(\frac{3}{5}*1000) }{6}

Step-by-step explanation:

First, let's find out how many words Maria has left to write. If she has already finished 2/5 of her essay, she has 3/5ths left to write. We can do 3/5 times 1000 to find out how many words are left.

\frac{3 }{5} * \frac{1000}{1}

\frac{3000}{5}

600

Thus, there are 600 words left to write.

Now to find the amount of time, we can find how take to write 600 words at a pace of 6 words per minute by dividing 600 by 6.

\frac{600}{6}

100

It will take 100 minutes for Maria to write the rest of her essay. Now let's think about an expression that tells us this information. It sounds like your questions is supposed to have options, but I doesn't seem like you've posted them, no worries however.

So first, the amount she has left to write.

(\frac{3}{5} * 1000)

We know this is 600, but we don't have to simplify it for the expression.

Now thinking back to how we found the time, we can divide this '600' by 6.

\frac{(\frac{3}{5}*1000) }{6}

This is the expression that shows the amount of time it will take to write the rest of the essay.

\frac{((1-(\frac{2}{5})*1000) }{6} is also a valid solution.

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How many times can 167 go into 1135.
Bingel [31]
It can go 6.8 times


Good luck! :D
5 0
3 years ago
Read 2 more answers
For which values of x is the expression undefined?<br> x2 – 49<br> x2 – 16
Lyrx [107]

You meant to say x^2 - 49 and the second binomial is x^2 - 16.

x^2 - 49 = (x - 7) (x + 7).

Set each factor to 0 and solve for x individually.

x - 7 = 0

x = 7

x + 7 = 0

x = -7

Do the same for x^2 - 16.

Here is the set up:

x^2 - 16 = (x - 4) (x + 4).

Take it from here.

4 0
3 years ago
Find sin x/2, cos x/2, and tan x/2, if cos x = -12/13, 180 degrees is less than x which is less than 270 degrees
Rashid [163]
Cos x = -12/13
sin x = -sqrt(13^2 - 12^2) / 13 = -5/13
tan x = 5/12

tan x/2 = (1 - cos x) / sin x = 1 - (-12/13) / -5/13 = 25/13 * -13/5 = -5

2sin^2 x/2 = 1 - cos x = 1 - (-12/13) = 25/13
sin^2 x/2 = 25/13 / 2 = 25/26
sin x/2 = 5/√26

sin x/2 / cos x/2 = tan x/2
cos x/2 = sin x/2 / tan x/2 = 5/√26 / -5 = -1/√26

sin x/2 = 5/√26
cos x/2 = -1/√26
tan x/2 = -5
5 0
3 years ago
Find the 50th term of the sequence 5, -2, -9, -16, ...
Elodia [21]

Answer:

-338

Step-by-step explanation:

So we have the sequence:

5, -2, -9, -16...

First, note that this is an arithmetic sequence.

This is because each individual term is the previous term <em>added</em> by a common difference.

We can see that this common difference is -7, because each subsequent term is 7 <em>less</em> than the previous one. For example, 5 minus 7 is -2, -2 minus 7 is -9, and so on.

So, to find the 50th term, we can write an explicit formula for our sequence.

The standard form for the explicit formula for an arithmetic sequence is:

x_n=a+d(n-1)

Where a is the initial term, d is the common difference, and n is the nth term.

We can see that our initial term a is 5. And we also already determined that the common difference d is -7. So, substitute:

x_n=5-7(n-1)

Now, to find the 50th term, all we have to do is to substitute 50 for n. So:

x_{50}=5-7(50-1)

Subtract within the parentheses:

x_{50}=5-7(49)

Multiply:

x_{50}=5-343

Subtract:

x_{50}=-338

So, the 50th term is -338.

And we're done!

8 0
3 years ago
Lily read 4 books in December and read 7 books in January. What percent did she increase the number of books she read?
OLEGan [10]

Answer: 175%

Step-by-step explanation:

7/4 x 100 = 1.75

5 0
3 years ago
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