Y is inversely proportional to
x
.
When
y
=
25
,
x
=
4

Work out
x
when
y
=
20

x = 5

Step-by-step explanation:

Given that y is inversely proportional to x then the equation relating them is

y = ← k is the constant of proportion

To find k use the condition when y = 25 , x = 4 , then

25 = ( multiply both sides by 4 )

100 = k

y = ← equation of proportion

When y = 20, then

20 = ( multiply both sides by x )

20x = 100 ( divide both sides by 20 )

x = 5

complete the steps to find the area of the trapezoid.

area of rectangle = 256   square units

area of triangle 1 = 24  square units

area of triangle 2 = 16  square units

area of triangle 3 =   96 square units

area of trapezoid = 120  square units

step-by-step explanation:

47 - 90 = 43

43 - 180 = x

x = 137