Error analysis: a student writes the difference between 15 and the product of 5 and y to describe the expression 5y - 15. explain the error

The error is that first we have to do product of 5 and 15 and it would be 75 and when y will come and it would be 75y.

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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