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o-na [289]
3 years ago
9

-7+b=-8 step by step plz

Mathematics
2 answers:
seraphim [82]3 years ago
8 0

Answer:

b=-1

Step-by-step explanation:

add 7 to both sides

simplify

Gelneren [198K]3 years ago
7 0

Answer:

b=-1

Step-by-step explanation:

-7+b=-8

Add 7 to each side to isolate b

-7+7+b=-8+7

b = -1

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Verify the identity: <br> (1-sinx)/cosx = cosx/(1+sinx)
Lisa [10]
For the answer to the question above,
<span>Let's work with the left-hand side 
We're going to times cosx/1-sinx by 1+sinx/1+sinx, you can do this because 1+sinx/1+sinx is equal to 1, so you aren't really changing anything. 

After you've times the top and bottom by 1+sinx, you get: 

cosx(1+sinx) / (1-sinx)(1+sinx) 

The denominator is a difference of squares, so you get 1-sin^2 x 

what you have now is 

cosx(1+sinx) / 1-sin^2x 

You know that 1-sin^2x is equal to cos^2x 

so know you have 

cosx(1+sinx) / cos^2x 

get rid of the cosx on top by simplifying and the cos^2x so that you're left with 

(1+sinx) / cos x 

Therefore cosx / 1- sinx = 1 + sinx / cos x</span>
4 0
3 years ago
20 = x/4 - 13 help plz thank you
murzikaleks [220]

Answer: x = 132 daw

Step-by-step explanation: believe me

4 0
3 years ago
Read 2 more answers
If sarah is 24 years younger than her mother and if the sum of their age is 68 how old is sarah
UkoKoshka [18]
The sum of two numbers if just the numbers added together, so you would just need to do some simple algebra.

The ages added together are 68, and the opposite of addition is subtraction!

(total age) - (sarahs age) = (mothers age)
68 - 24 = 44

44 should be her mothers age!


(If you were trying to calculate the sum of their ages, you would just add them together, and 24 + 44 = 68)

7 0
3 years ago
. Show ALL work for the following problem... if you write the answer only, you will not get brainlist: 2(x - 2) = 4x - 6(x - 2)
Rom4ik [11]

Distribute 2 to x and -2, and -6 to x and -2

2(x - 2) = 2x - 4

-6(x - 2) = -6x + 12

2x - 4 = 4x - 6x + 12

Simplify. Combine like terms

2x - 4  = (4x - 6x) + 12

2x - 4 = -2x + 12

Isolate the x. Add 4 to both sides, and 2x to both sides

2x (+2x) - 4 (+4) = -2x (+2x) + 12 (+4)

2x + 2x = 12 + 4

Simplify

4x = 16

Isolate the x. Divide 4 from both sides

4x/4 = 16/4

x = 16/4

x = 4

4 is your answer for x.

hope this helps

6 0
3 years ago
The equation represents an ellipse.
Tom [10]

Answer:

B) (-10, -6) and (8, -6)

Step-by-step explanation:

6 0
3 years ago
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