Your question can be written as:

22/3  + 12

= [22 + 36] / 3

= 58/3 or 19 1/3 or 19.33

Hope this helped you to some extent.

By convention,

1 inch = 2.54 cm

By convention,

1 feet = 12 inches

& 1 inch = 2.54 cm

So, 1 feet = 12 × 2.54 = 30.48 cm

Hope this helped you to some extent.

By convention

1 inch = 2.54 cm

So, 1 cm = 1/2.54 inch

Hence, 1.5 cm = 1.5/2.54 inch = 0.59 inch

Hope this helped you to some extent.

Problem

-(3x+5y) remove ( )

On removing the brackets, we have

- 3x  - 5y [ Use of sign convention on multiplication i.e. (-) × (+) = ( -) ]

Hope this helped you to some extent.

fifty eight divided by two thirds

= 58 / (2/ 3)

= 58 × 3  / 2

= 29 × 3

= 87 

Hope this helped you to some extent.

Problem

what percent of 100 = 19

i.e. y % of 100 = 19

i.e. y/100 × 100 = 19

So, y = 19

Hence the required percentage is 19%.

Hope this has deleted your confusion.

1/5+1/3 x 1/4

= 1/5 + 1/12

= [ 1 × 12 ] / [ 5 × 12] + [ 1 × 5 ] / [ 12 × 5 ] [ L.C.M of 5 & 12 is  5 × 12 = 60 ]

= 12/60 + 5/60 

= [ 12 + 5 ] / 60 [ Addition of numerator since the denominator is same]

= 17/60

Hope this helped you to some extent. Now solve the other related problems with your friends.

2y=x+4

i.e. y = 1/2 x + 4/2

i.e. y = 1/2  x + 2

Comparing to the form y = mx +c , where m = slope of the line & c = y - intercept

So, slope (m) = 1/2

Hope this helped you to some extent. Now solve the other related problems with your friends.

8/12

= 2/ 3 [ Canceled by 4 on both numerator & denominator]

Note: Talking about the equivalent fractions to any fractions, there are more than one equivalent fractions. 

Tips- You can formed equivalent fractions by finding the multiple of fractions [ i.e. multiplying numerator & denominator by a counting number].

Hope this helped you to some extent. Now share the ideas with your friends too.