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love history [14]
3 years ago
8

If u can explain please :)

Mathematics
1 answer:
zhannawk [14.2K]3 years ago
7 0

Answer:

it would be c because 12+8 = 20 and 24 is closer to 20

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Factorise the expressions and divide them as directed.​
Annette [7]

a) 3(x-9)= 3x -9

3x-27=3x -9

3x-3x=-9+27

x=18

b) 2x+3x=5x^2

2x+3x=( 5x)^2

2x+3x=25x

5x=25x

x=25x/5

x=5x

6 0
3 years ago
3/7 s = 6 solve to find the number of students
spayn [35]
3/7 s = 6 

[multiple by 7/3 on both sides]
s = 14
8 0
4 years ago
Find an identity for cos(4t)
s344n2d4d5 [400]
We must know that \cos(2x)=2\cos^2(x)-1. So:

\cos(4t)=\cos(2\cdot2t)\\\\
\cos(4t)=2\cos^2(2t)-1\\\\
\cos(4t)=2(2\cos^2(t)-1)^2-1\\\\
\cos(4t)=2(4\cos^4(t)-4\cos^2(t)+1)-1\\\\
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\boxed{\cos(4t)=8\cos^4(t)-8\cos^2(t)+1}
5 0
3 years ago
Math Help. Greatly Appreciated
Triss [41]
So we know that the perimeter is 1260 feet and that the length is 100 more than the width, but we don't know that the width is.
So we're going to start with finding the width.
w = (x + x + 100) = 1260
from there we need to combine like terms
x + x = 2x
now we have
2x + 100  = 1260
From there, we will need to remove 100 from both sides, leaving us with
2x = 1160
now we'll need to divide both sides by 2
2x \div 2x = x
1160 \div 2 = 580
We now know that the width is 580, or more simply put, x=580.

Finding the length will be the easy part, as we know that it is just 100 more than the width
580 + 100 = 680
If you want an easier way of finding the length, just subtract the width from the perimeter.
1260 - 580 = 680
Leaving the final answer to be
Width = 580
Length = 680

3 0
3 years ago
Please help D: Given f (x) = 3 x minus 1 and g (x) = 2 x minus 3, for which value of x does g (x) = f (2)?
AfilCa [17]
<h3>Answer:   D.  x = 4</h3>

===============================================

Explanation:

First compute f(2)

f(x) = 3x-1

f(2) = 3(2) - 1 ... replace every x with 2; use PEMDAS to simplify

f(2) = 6 - 1

f(2) = 5

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g(x) = 2x-3

2x-3 = g(x)

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2x-3+3 = 5+3 ... add 3 to both sides

2x = 8

2x/2 = 8/2 ... dividing both sides by 2

x = 4

8 0
4 years ago
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