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r-ruslan [8.4K]
3 years ago
9

How to evaluate this expression -3 . (6 + 4 . 2)

Mathematics
1 answer:
lilavasa [31]3 years ago
4 0

Answer:

9

Step-by-step explanation:

All you have to do is follow this order while working a problem!

Example 1:

If a = 4 and b = 5, what is ab – 2b?

Since there are no parentheses or exponents,

you first plus in the values for a and b and multiply those together.

(4 ´ 5) You get 20.

Then, you multiply 2b or (2 ´  5 )which gives you 10.

Last, you subtract the second answer from the first (20 -10),

which gives you 10!

Example 2:

Evaluate 6x / 4 when x = 6.

Because multiplication and division are equal in the order of operations, you solve the problem by reading it from left to right like one would read a book.

6 x 6 = 36.

You then divide that number by 4.

The correct answer is 9.

(clip art was taken from http://www.kidsdomain.com/holiday/school/clip.html)

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Strike441 [17]

Answer:

Each can of soda costs about 33 cents.

Step-by-step explanation:

This is just a simple division problem, and you can find the answer by dividing the cost of the sodas by the total number of sodas, so 4/12. If you complete that problem, the answer is 0.33 repeating, and since it asks you to round to the nearest hundredth, the answer is just 0.33. It is in dollar amounts, so the answer is 33 cents.

3 0
3 years ago
Find the surface area of polyhedra <br>Pls!! show how you got the surface area ​​
quester [9]

Answer:

52.48

Step-by-step explanation:

find the cross sectional area which is the triangle

triangle = 1/2 x 8.2 x 6.4 = 26.24

then, use the area to multiply by the extended length of 2

26.24 x 2 = 52.48

4 0
3 years ago
The simple interest I on an investment of p dollars at an interest rate r for t years is given by I=prt. Find the time it would
Nikitich [7]

Answer:

Step-by-step explanation:

You have the formula written correctly, so now we just need to fill it in with what we have. Our principle, or initial investment, is 21,000; our interest rate of 4.6% as a decimal (always as a decimal!) is .046; and our interest earned is 900.  We need to find t. Setting up with what we have:

21000(.046)(t) = 900 and

966t = 900 and

t = .931 years

.9 of a year is the same as 10.8 months or so.

6 0
3 years ago
Y<br><img src="https://tex.z-dn.net/?f=y%20%5Cleqslant%20%20-%20%20x%20-%201%20%5C%5C%20y%20%5Cgeqslant%202x%20%2B%204" id="TexF
Flura [38]
y\leq-x-1\\\\y=-x-1\\for\ x=-1\to y=-(-1)-1=1-1=0\to(-1;\ 0)\\for\ x=0\to y=-0-1=-1\to(0;-1)

y\geq2x+4\\\\y=2x+4\\for\ x=-2\to y=2\cdot(-2)+4=-4+4=0\to(-2;\ 0)\\for\ x=0\to y=2\cdot0+4=0+4=4\to(0;\ 4)

Answer in an attachment.

3 0
3 years ago
Find each sum or difference. Show your work. <br><br> a^2+5a-3-(2a^2-4a+3)<br><br> Plz help!
anzhelika [568]
Hey there :)

( a² + 5a - 3 ) - ( 2a² - 4a + 3 )

Combine like-terms

a² - 2a² + 5a - ( - 4a ) - 3 - 3
- 1a² + 5a + 4a - 6

- a² + 9a - 6
6 0
4 years ago
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