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Dimas [21]
3 years ago
13

Negative nine times a number equals -117

Mathematics
2 answers:
Rus_ich [418]3 years ago
7 0
-9(x) = -117

Solve for "a number" (x). Isolate it. Note the equal sign. What you do to one side, you do to the other. Divide -9 from both sides.

-9x/-9 = -117/-9

x = -117/-9

x = 13

13 is your answer

hope this helps
irakobra [83]3 years ago
6 0
Let's have X represent the number we're looking for.
Times means that we are multiplying, so let's make an equation.
-9x=-117
We know by looking at this equation that the number is positive since the number is multiplied by a negative and the answer is negative.
Let's get x by itself by dividing both sides by -9.
-117÷-9=13=x

So, the number is 13.
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The fifth term of a geometric series is 405 and the sixth term is 1215. Find the sum of the first nine terms. Don't know how to
Margarita [4]
Since the sixth term is 1215 and the 5th term is 405, we know each term is 3 times more than the last.
Let 'n' represent the first term, then the sum of the first 9 terms can be written as:
n+3n+9n+27n+81n+243n+729n+2187n+6561n
which sinplifies to 9841n
since each term is 3 times the last, the first term must be 405 divided by 3, 4 times in total, which is 5
Now subsitute 'n' for 5, and we get 9841(5)
which is 49205 which is the answer.

Hope this helps
5 0
3 years ago
Pls answer i'll mark u brainlist
In-s [12.5K]

Answer: 2/3 hours

Step-by-step explanation:

okay so the speed now is 850, which is   850/340  = 2.5 times the original speed

Since It's 2.5 times the original speed,

2.5x = 5/3

so x = 5/3/2.5 = 2/3

7 0
2 years ago
Read 2 more answers
In interval notation signs use what grouping symbol?
Vesnalui [34]

Answer:

either parentheses or brackets

Step-by-step explanation:

(x,y) means that the number is not included in interval notation

[x,y] means that the number is included in interval notation

3 0
2 years ago
How do you find the missing height of a triangle?
g100num [7]

Answer:

Use the Pythagorean theorem

Step-by-step explanation:

The pythagorean theorem is a^{2} +b^{2} =c^{2} where a is a height, b is a height, and c is the hypotenuse, which is the longest side of a triangle. For example, if the triangle has two side with lengths of three and four we would put them into the equation to get:

3^{2} +4^{2} =c^{2}

Simplify the equation to get:

9+16=c^2

Add 16 and 9 to get 25 and take the square root of both sides:

\sqrt{25} =c

The sqrt of 25 is 5. Therefore, the length of the hypotenuse, or c, is 5.

8 0
2 years ago
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NEED HELP, DUE SOON! Find the area of the composite figure below and then chose the correct answer.
klemol [59]

Answer:

A) 288.62

Step-by-step explanation:

10.4×15.3= 159.12

10.4²+15.3²= X²

342.25= X²

18.5= X

7×18.5= 129.5

129.5+159.12= 288.62

4 0
2 years ago
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