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VladimirAG [237]
3 years ago
6

Simply the problem.

Mathematics
2 answers:
Marat540 [252]3 years ago
6 0

Answer:

C

Step-by-step explanation:

\sqrt{3}\cdot\sqrt{21}= \\\\\sqrt{3\cdot 21}= \\\\\sqrt{63}= \\\\3\sqrt{7}

Therefore, the correct answer is choice C. Hope this helps!

zlopas [31]3 years ago
4 0

Answer:

3√7

Step-by-step explanation:

√3×√21=√63

√63=√7×√9=√7 × 3

=3√7

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Every Halloween, trick-or-treaters love going to Elise's house to see her spooky decorations and get some of her delicious caram
kati45 [8]

Answer:

The answer is Yes

Step-by-step explanation:

1) 2/5 = 18/45

2x45 = 18x5

90 = 90  True


2) 6/9 = 54/81

6x81 = 54x9

486 = 486  True

3 0
3 years ago
The digits of a two-digit number sum to 8. When the digits are reversed the resulting number is 18 less than the onginal
polet [3.4K]

Answer:

53

Step-by-step explanation:

Given: The sum of two digit number is 8

           Reversing the digit will get us number 18 less than the original.

Lets take x as tenth digit of our number and y as unit digit of our number.

As given sum of digit is 8

∴ x+y= 8

∴ y= 8-x -       equation 1

We also know that reversing the digit will get us number 18 less than the original.

∴ 10y+x = 10x +y-18

Now, lets put the value of y from equation 1

⇒ 10(8-x) + x = 10x+ (8-x)- 18

⇒ 80-9x= 9x-10

⇒ 90= 18x

∴ x= 5

Next, substituting the value of x in equation 1

y= 8-x

⇒ y= 8-5 = 3

∴ y= 3

∴ The original number is 53, sum of the digit is 8 and if we reverse the digit of the number, we get 35, which is 18 less than the original number.

7 0
3 years ago
❗❗PLEASE HELP ON THESE QUESTIONS❗❗
Cerrena [4.2K]

Answer:

i cant see it so thoerefore I cant answer it. Sorry!

Step-by-step explanation:

6 0
2 years ago
Find the size of the angle marked a and b on the diagram
Lana71 [14]

Answer:

Step-by-step explanation:

we know that the total angles around the big triangle are 180° so,  we know the right angle is 90° and we are told that one of the angles is 52° so just find the last angle by

180 = 90 + 52 + X

180 - 90 - 52 = X

38 = X

b = 38°

a = 52°

5 0
2 years ago
Read 2 more answers
<img src="https://tex.z-dn.net/?f=5%20%7B%7D%5E%7Bn%20%2B%201%7D%20%20%2B%205%20%7B%7D%5E%7Bn%20%2B%202%7D%20" id="TexFormula1"
alex41 [277]

Step-by-step explanation:

there 5^(n+1) + 5^(n+2) = 5^n x 5^1 + 5^n x 5^2 breaking them as x^(a+b) = x^a x x^b

then taking common 5^n from both terms

5 0
3 years ago
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