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marissa [1.9K]
4 years ago
11

Number 21 is what I need help on

Mathematics
1 answer:
Sliva [168]4 years ago
7 0

Answer: −50x−66

Step-by-step explanation:

4(10x+6)−10(9x+9)

Distribute:

=(4)(10x)+(4)(6)+(−10)(9x)+(−10)(9)

=40x+24+−90x+−90

Combine Like Terms:

=40x+24+−90x+−90

=(40x+−90x)+(24+−90)

=−50x+−66

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A triangle has three angles that measure 20 degrees, 60 degrees and
podryga [215]

Answer:

x=25  

Step-by-step explanation:  

A traingle has an area of 180 degrees, so we subtract 20 and 60, and are left with 100. 5x-25=100, add 25 to get that 5x=125, divide by 5 to get that x=25.

7 0
3 years ago
V256 = (1 point)<br> O 12<br> O 14<br> O 16<br> O 18
guapka [62]

Answer:

16 is your answer

Step-by-step explanation:

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How do I know which operation to use with a word math problem
Mamont248 [21]

Answer:

you use your biggest brain cell

Step-by-step explanation:

4 0
3 years ago
You buy some dining room furniture. The table costs $599.99 and 4 chairs cost $89.59/ chair. How much is your total purchase?
Rashid [163]

Answer: the chairs alone would cost $358.36, and since you would already know how much the table costs you would just add it together to get $958.35


Step-by-step explanation:


3 0
3 years ago
Read 2 more answers
If (3a-5b) : (3a+5b)=1:4 then find the value of a:b​
rodikova [14]

Answer:

a : b = 25 : 9

Step-by-step explanation:

(3a - 5b) : (3a + 5b) = 1 : 4

Product of extremes = product  of  means

(3a - 5b) *4 = (3a +5b) * 1    {Distributive property}

3a * 4  - 5b*4 = 3a + 5b

12a - 20b = 3a + 5b

Add 20b to both sides

12a = 3a + 5b + 20b

12a = 3a + 25b

Subtract 3a from both sides

12a - 3a = 25b

9a = 25b

\dfrac{a}{b}=\dfrac{25}{9}

a:b = 25 : 9

5 0
3 years ago
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