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Mekhanik [1.2K]
2 years ago
11

If Sin x = -¼, where π < x < 3π∕2 , find the value of Cos 2x

Mathematics
1 answer:
Sliva [168]2 years ago
5 0

Answer: 7/8

Cos2x has 3 formulas, Sinx is given in the question, we should use the formula with sinus. I guess that's the solution.

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justin wants to buy shorts that cost $35 and some shirts that are on sale for $22 each. He has $95 to spend. Write an inequality
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35 plus 22 -95 equal left seat on the right pole then pause
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3 years ago
3)
strojnjashka [21]

Answer:

2500 pence (C = 2500)

Step-by-step explanation:

C = 10t + 20m

From the given information, t is the number of texts so essentially you will plug in the number of texts provided (150) in the place of the variable t.

C = 10(150) + 20m

Apply the same thing to minutes, plug in the number of minutes (50) in the place of the variable m.

C = 10(150) + 20(50)

Now multiply the substitutes with the co-efficient.

C = 1500 + 1000 (10*150=1500 & 20*50=1000)

Add the addends

C = 2500

7 0
2 years ago
The difference between a number squared and 10 is 71 just translate please don't solve.
AnnyKZ [126]

Step-by-step explanation:

Things I notice about this problem:

  • "Difference" indicates subtraction.
  • "Is" means "equals".
  • When a problem simply says "a number," I replace it with a variable.

It is written out like this: x^{2} - 10 = 71.

3 0
3 years ago
Marie’s college nicki thanks with green bank. they are for savings account with a higher interest rate than blue bank. 5% and ne
kifflom [539]
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3 0
2 years ago
A cell phone company charges a monthly rate of $10.00 and $0.20 a minute per call. Write an equation that can be used to determi
Aleks04 [339]

Answer:

y = 0.20m + 10, 100 minutes

Step-by-step explanation:

Equation: y = mx + b

Fill it in.

m = slope = 0.20

b = y-intercept = 10

y = 0.20x + 10 (They wanted the variable to be m. So, changing that.)

y = 0.20m + 10

Fill in.

30 = 0.20m + 10

Solve.

20 = 0.20m

100 = m

She was on the phone for 100 minutes.

3 0
2 years ago
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