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deff fn [24]
3 years ago
6

Pls help! I’ll give brainliest! A = ___ ?? B = ___ ??

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
5 0

Answer:

A:80 B:30

Step-by-step explanation:

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If sin(a) = cos(2a), then what is the value of a?
Mariulka [41]

Answer:

-90 , 30

Step-by-step explanation:

sina = cos(2a)

       = 1 - 2(sina)^2

2(sina)^2 + sina -- 1 = 0

( sina + 1 )( 2sina - 1 ) = 0

sina = -1                     or sina = 1/2

=> a = -90 degrees   or => a = 30 degrees

     

3 0
3 years ago
Solve the following inequality for x.<br> PLEASE HELP
mina [271]
I think it’s C. Because
X ≤ 9and 9 is higher than -7 (sorry if I’m wrong)




8 0
3 years ago
2 - 3x = -x - 8 Solve for X
icang [17]

Answer:

X=5

Step-by-step explanation:

(step 1) 2 - 3x = -x - 8

-3x + 2 = -x -8

(step 2)

-3x + 2 = -x - 8

-3 + 2 - 2 = -x -8 -2

(step 3)

-3x =  -x- 10

(step 4)

-3 + x = -x -10 +x

(step 5)

-2x = -10

Answer

x = 5

3 0
3 years ago
Solve for x.<br><br> 2/x^2−4 − 1/x+2=3/x−2<br><br><br><br><br> −32<br><br> −12<br><br> 23<br><br> 2
Alex Ar [27]

Answer:

x = -1/2.

Step-by-step explanation:

x^2 - 4 = (x - 2)(x + 2)  so if we multiply each term by x^2 -4 we get:

2 - 1(x - 2) = 3(x + 2)

2 - x + 2 = 3x + 6

2 + 2 - 6 = 3x + x

4x = -2

x = -1/2.

4 0
3 years ago
Read 2 more answers
((10 + 5) - (24 ÷ 8 ) ^2) + 2^2
Ann [662]
((10+5)-(24/8)^2)+2^2
(15-3)^2+2^2
12^2+2^2
144+4
148

Final answer: 148
Follow the order dictated by parentheses. When none are apparent, use the order of operations to decide what to do next.
6 0
3 years ago
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