first, make an equation:

then, add twelve to both sides to remove it from the right:

then just divide by (-3) to get the value of x:

Step-by-step explanation:
By Cosine rule, we have
s² = t² + u² - 2(t)(u)(cosS)
=> cosS = (t² + u² - s²)/2tu
=> cosS = (58² + 27² - 50²) / (2 * 58 * 27) = 0.5086.
Therefore S = cos^-1(0.5086) = 59.4° (1d.p.)
<h3>One less than the product of four and a number is 11. What is that number ?</h3>
Answer: The number is 3
Step-by-step explanation:
We will call X the number, then 4X - 1 = 11
4X = 11 + 1 =12
X = 12/4 =3
This is the number = 3
6 lessons per week multiplied by the number of weeks in a year
6 x 52 = 312
total - 5 missed
312 - 5 = 307 dance lessons