Write the equation, use “X” to represent the unknown number. Solve for the unknown 20. The difference between a number and 16 is the square of (-5)

21. When three times A number is increased by five, The result is 10.

22. When is 3 sevenths of a number is decreased by two, The result is eight

Step-by-step explanation:

20)

x - 16 = (-5)²

x - 16 = 25

x = 25 + 16

x = 41

21)

3x + 5 = 10

3x = 10 - 5

3x = 5

x = 5/3

22)

3/7 of x - 2 = 8

3x - 14/7 = 8

3x - 14 = 8 × 7

3x - 14 = 56

3x = 56 + 14

3x = 70

x = 70/3

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step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)

answer:      

step-by-step explanation: