Lynn Byrd, Greg Byrd and, Chris Pearce Solutions for Chapter: Expressions, Formulae and Equations, Exercise 5: Exercise 2.4

Copy and complete the following:

$2\left(x+9\right)=2\times x+2\times 9$

$=2x+$_____

Copy and complete the following:

$3\left(y-1\right)=3\times y-3\times 1$

$=3y-$_____

The diagram shows a rectangle.The width of rectangle is $8 \mathrm{cm}$, the length of rectangle is $3\mathrm{y}+4 \mathrm{cm}$.Write an expression in its simplest form for the area of rectangle.

The diagram shows a rectangle.The width of rectangle is $8 \mathrm{cm}$, the length of rectangle is $3\mathrm{y}+4 \mathrm{cm}$.Write an expression in its simplest form for the perimeter of rectangle.

In the triangle $ABC$,the angle at $A$ is $\left(4k-7m\right)°$.The angle at $B$ is two times size of angle at $A$.Write an expression in its simplest form,for the size of angle at $B$.

Expand and simplify the given expression
$4\left(x+7\right)-1$

Expand and simplify the given expression
$7\left(x+3\right)+5x$

Expand and simplify the given expression
$12+3\left(2x-3\right)$