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3 years ago

Please help I don’t understand please

Mathematics

2 answers:

defon3 years ago

6 0

Answer:

Step-by-step explanation:

A) 7.2 because there's a 5 next to the 1, we round up

b) 0.76 because there’s a 8 next to the 5, we round up

c) 6.44 because there’s a 8 next to the 3, we round up

irinina [24]3 years ago

3 0

Answer:

7.2

0.76

6.4

thats the answer

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What is the product of (2x +3x - 1) and (3x+5)?

-Dominant- [34]

Answer: I would think it would be 5x-1 and 3x+5,

I may be wrong i'm only in 8th grade >.>

7 0

4 years ago

A number is 1/7 of another number the difference of the numbers is 18 (assume that you are subtracting the smaller number from t

Marina86 [1]

Answer:

Step-by-step explanation:

x = y/7

y-x = 18

y - y/7 = 18

(6/7)y = 18

y = 21

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3 years ago

Find two numbers if their sum is 91 and the ratio is 6:7.

sammy [17]

Answer:

42:49

Step-by-step explanation:

6x + 7x = 91

13x = 91

x = 7

6 x 7 = 42

7 x 7 = 49

then 42:49

5 0

4 years ago

Read 2 more answers

Mary ran miles on Monday. On Wednesday, she ran times as far as she ran on Monday. Which best describes how far Mary ran on Wedn

Ad libitum [116K]

Answer:

How many miles?

Step-by-step explanation:

7 0

4 years ago

Worth 25 points!

MrRissso [65]

Answer:

1) $\sqrt{-48}=4\sqrt{3} \ i$

2) $\sqrt{-63}=3\sqrt{7} \ i$

3) $\sqrt{-72}=6\sqrt{2} \ i$

4) $\sqrt{-24}=4\sqrt{6} \ i$

5) $\sqrt{-84}=2\sqrt{21} \ i$

6) $\sqrt{-99}=3\sqrt{11} \ i$

Step-by-step explanation:

We need to simply the following :

<u>Note: For all questions given we know that </u> $\sqrt{-1}=i$ <u> using it in all the given questions.</u>

1) $\sqrt{-48}$

Factors of 48 are: 2x2x2x2x3

$\sqrt{-48}\\=\sqrt{48}\sqrt{-1} \\=\sqrt{2\times2\times2\times2\times3}\ i\\= \sqrt{2^2\times2^2\times3}\ i\\=2\times2\sqrt{3} \ i \\=4\sqrt{3} \ i$

2) $\sqrt{-63}$

Factors of 63 are: 3x3x7

$\sqrt{-63}\\=\sqrt{63}\sqrt{-1} \\=\sqrt{3\times3\times7}\ i\\= \sqrt{3^2\times7}\ i\\=3\sqrt{7} \ i$

3) $\sqrt{-72}$

Factors of 72 are: 2x2x2x3x3

$\sqrt{-72}\\=\sqrt{72}\sqrt{-1} \\=\sqrt{2\times2\times2\times3\times3}\ i\\= \sqrt{2^2\times3^2\times2}\ i\\=2\times3\sqrt{2} \ i \\=6\sqrt{2} \ i$

4) $\sqrt{-24}$

Factors of 24 are: 2x2x2x3

$\sqrt{-24}\\=\sqrt{24}\sqrt{-1} \\=\sqrt{2\times2\times2\times3}\ i\\= \sqrt{2^2\times2\times3}\ i\\=2\sqrt{2\times3} \ i \\=2\sqrt{6} \ i$

5) $\sqrt{-84}$

Factors of 84 are: 2x2x3x7

$\sqrt{-84}\\=\sqrt{84}\sqrt{-1} \\=\sqrt{2\times2\times3\times7}\ i\\= \sqrt{2^2\times3\times7}\ i\\=2\sqrt{21} \ i$

6) $\sqrt{-99}\\$

Prime factors of 99 are: 3x3x11

$\sqrt{-99}\\=\sqrt{99}\sqrt{-1} \\=\sqrt{3\times3\times11}\ i\\= \sqrt{3^2\times11}\ i\\=3\sqrt{11} \ i \\=3\sqrt{11} \ i$

6 0

3 years ago