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Viktor [21]
3 years ago
8

Help me with all these​

Mathematics
2 answers:
frosja888 [35]3 years ago
8 0
Number 4 is C because when you do 28 times 5 your get 140 then you do 140 divided by 20 to get 7 when you do proportions to find the missing number you cross multiply with the numbers there and divide with the number that is across from the missing
Number 5 is $6 because to find the missing number you have to see which way makes sense you could do 4 divided by 3 but you get a really long number so if you do 3 divided by 4 you get .75 and you get .75 for all cost is usually the y-axis so you do y divided x so then do .75 times 8 to get the answer
Number 6 to plot them you just go in the middle of the line for the first because it is not directly 2
Number 7 to change a fraction to decimal do the numerator divided by denominator even if the denominator is bigger so 6 divided by 25 is .24 for decimal form to get the percent move the decimal point two places to the right so it will be 24%
Archy [21]3 years ago
4 0

Answer:

<em>1)</em> C. 7

<em>2a)</em><em> </em>$10.66

<em>2b)</em><em> </em>plot each price and amount at the correct spot

<em>3a)</em><em> </em>0.24

<em>3b)</em><em> </em>%24

Step-by-step explanation:

<em>1)</em> cross multiply the equation: 5*28 =140 and m*20=20m

tun the answers back into an equation: 20m=140

divide both sides by 20: <u><em>m=7</em></u>

<em>2a)</em><em> </em>divide 3 by 2.25: 3/2.25=$1.33(repeating)

divide 4 by 3: 4/3.00=$1.33(repeating)

divide 6 by 4.5=$1.33(repeating)

(because now you know that 1 box of Mac N' Cheese is $1.33) multiply 8 by 1.33(repeating):8*1.33(repeating)=<u><em>$10.66</em></u>

<em>3a)</em> divide 6 by 25: 6/25= <em><u>0.24</u></em>

<em>3b) </em>multiply 0.24 by 100: 0.24*100= <em><u>%24</u></em>

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George’s age is three times that of his brother. When you add George’s age to his brother’s, you get 24. How old is each brother
vivado [14]

Answer:

G=18

Step-by-step explanation:

George-G

1/3G+G=24

4/3G=24

3/4*4/3G=24*3/4

G=18

George will be 18 years old there we can find his brothers age by dividing it by three thus 18/3=6

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Describe a real world situation for the equation +4+(-4=0
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6 0
3 years ago
Help is appreciated! Thanks!
sukhopar [10]

Answer:

  1. 16√3
  2. -45+15i
  3. √255
  4. 6√2 +3√10

Step-by-step explanation:

1)

-4i\sqrt{-48}=-4i\sqrt{(-1)(4^2)(3)}=(-4i)(4i)\sqrt{3}=16\sqrt{3}

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2)

(-5-5i)(3-6i)=-5(3-6i)-5i(3-6i)=-15+30i-15i+30i^2=-15-30+15i\\\\=-45+15i

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3)

\sqrt{3}\sqrt{5}\sqrt{17}=\sqrt{3\cdot 5\cdot 17}=\sqrt{255}

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4)

\sqrt{3}(\sqrt{24}+\sqrt{30})=\sqrt{3\cdot 24}+\sqrt{3\cdot 30}=\sqrt{6^2\cdot 2}+\sqrt{3^2\cdot 10}\\\\=6\sqrt{2}+3\sqrt{10}

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\sqrt{a^2b}=a\sqrt{b}\\\\i^2=-1

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