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Bogdan [553]
3 years ago
6

Which of the following is a solution to 2cos x + 1 = 0?

Mathematics
1 answer:
nlexa [21]3 years ago
3 0
The answer is b
2cos x + 1 = 0
2 cos x = -1
cos x = -1/2
x = cos^1(-1/2)
(cos inverse (-1/2))
x = 120°
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The expressions 4 (y - 3) and 4y - 12 are equivalent?True or False
Vinvika [58]

4(y - 3) and 4y - 12

yes they are equivalent

4(y - 3) = 4y - 12 using the distributive property the result is the same.

8 0
1 year ago
Chara sold 52 boxes of candy for her marching band fundraiser. The large box costs $3.50 each and the small box costs $1.75 each
Ahat [919]

Answer:

The number of boxes of candy sold are:

40 small boxes and

12 large boxes of candy.

Step-by-step explanation:

Let the number of small boxes sold = x

Let the number of large boxes sold = y

we are given the following information:

x + y = 52 - - - - - -(1)   (Chara sold 52 boxes of candy)

3.5(y) + 1.75(x) = 112 - - - - - - (2)   (Chara sold $112 worth of candy)

From the two equations above, x and y can be solved as follows:

x + y = 52   - - - - - -(1)

x = 52 - y    - - - - - - (3)

putting the value if x in equation (3) to replace x in equation (2);

3.5(y) + 1.75(x) = 112 - - - - - - (2)

3.5(y) + 1.75(52 - y) = 112

3.5y + 91 - 1.75y = 112

(3.5y - 1.75y) + 91 = 112

1.75y = 112 - 91 = 21

y = 21 ÷ 1.75 = 12

y = 12

Now, let us put the value of y into equation (3)

x = 52 - y    - - - - - - (3)

x = 52 - 12 = 40

Therefore,

40 small boxes and 12 large boxes of candy were sold.

7 0
3 years ago
Use I = PRT to solve. (time in years)
vivado [14]

Simple interest is $ 9

<em><u>Solution:</u></em>

Given that,

P = $ 400

R = 9 \% = \frac{9}{100} = 0.09

T = 0.25 years

<em><u>The formula for simple interest is:</u></em>

I = P \times R \times T

Where,

I is the simple interest earned

R is the rate of interest in decimal

T is the number of years

<em><u>Substituting the values we get,</u></em>

I = 400 \times 0.09 \times 0.25\\\\I = 36 \times 0.25\\\\I = 9

Thus simple interest is $ 9

8 0
2 years ago
HELP PLS
aleksandrvk [35]
So this is a lot of work but ghe answers are (fix)
4 0
3 years ago
Read 2 more answers
A garden snail traveled 1⁄40 of a mile in 1⁄2 an hour. What was the speed of the snail?
photoshop1234 [79]
2/40 miles per hour.

Hoped I helped!
3 0
3 years ago
Read 2 more answers
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