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snow_tiger [21]
3 years ago
10

Seven times a number plus three times the same number is subtracted from 7

Mathematics
2 answers:
V125BC [204]3 years ago
7 0

Answer: 4x + 21 or 7 - 10x or -7x^2 - 3x + 7

not sure based on how the question is worded but it could be either 4x + 21 or 7 - 10x or -7x^2 - 3x + 7

Step-by-step explanation:

option 1

7x + 3(7-x)

= 7x + 21 - 3x

= 4x + 21

option 2

7 - (7x + 3x)

= 7 - 10x

option 3

7- (x(7x + 3))

7 - (7x^2 + 3x)

-7x^2 - 3x + 7

cricket20 [7]3 years ago
3 0
Option 3nzksmlalaow wl xkdodmx
Xox clxo ii mc cicico
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The cosine of 23° is equivalent to the sine of what angle
Archy [21]

Answer:

So 67 degrees is one value that we can take the sine of such that is equal to cos(23 degrees).

(There are more values since we can go around the circle from 67 degrees numerous times.)

Step-by-step explanation:

You can use a co-function identity.

The co-function of sine is cosine just like the co-function of cosine is sine.

Notice that cosine is co-(sine).

Anyways co-functions have this identity:

\cos(90^\circ-x)=\sin(x)

or

\sin(90^\circ-x)=\cos(x)

You can prove those drawing a right triangle.

I drew a triangle in my picture just so I can have something to reference proving both of the identities I just wrote:

The sum of the angles is 180.

So 90+x+(missing angle)=180.

Let's solve for the missing angle.

Subtract 90 on both sides:

x+(missing angle)=90

Subtract x on both sides:

(missing angle)=90-x.

So the missing angle has measurement (90-x).

So cos(90-x)=a/c

and sin(x)=a/c.

Since cos(90-x) and sin(x) have the same value of a/c, then one can conclude that cos(90-x)=sin(x).

We can do this also for cos(x) and sin(90-x).

cos(x)=b/c

sin(90-x)=b/c

This means sin(90-x)=cos(x).

So back to the problem:

cos(23)=sin(90-23)

cos(23)=sin(67)

So 67 degrees is one value that we can take the sine of such that is equal to cos(23 degrees).

6 0
2 years ago
Find the missing terms in the<br>sequence 27, ? , 23, ? , 19,...<br>good luck​
Vikki [24]
Is it subtract by 2? So I think it would be 27,25,23,21, 19
8 0
3 years ago
Answer all for brainliest
sergey [27]

Answer: 1/10 is greater; niether its equal; 2 1/2, .25, -.2, -1/2, -4/5

Step-by-step explanation:

1/10 is a tenth and .09 is a hunderedth

7 0
3 years ago
Four times the larger of two consecutive even integers is ten less than the smaller. What is the larger of these two numbers?
anygoal [31]

Answer:

-4 is the larger integer

Step-by-step explanation:

n = smaller integer

n + 2 = larger integer

4(n+2) = n-10

4n + 8 =  n - 10

3n + 8 = -10

3n = -18

n = -6

n+2 = -4

7 0
3 years ago
The sum of two numbers is 108. the difference of the same numbers is 78. what are the numbers
Nimfa-mama [501]

The sum of two numbers:

x + y = 108

The difference of the same two numbers:

x - y = 78

We can use substitution to figure out x and y:

x - y = 78 can be changed to x = 78 + y

We can plug this into the first equation:

78 + y + y = 108

78 + 2y = 108

2y = 30

y = 15

Now solve for x using any of the two equations. I'll use the first equation since it's easier:

x + 15 = 108

x = 93

4 0
3 years ago
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