Unit 9 Expressions and formulae review

Simplify this expression.
 $y^{10}\times y^4$  

Simplify this expression.
 $72y^{15}\div8y^6$  

Write an expression for the perimeter of this figure.

Write it in its simplest form.

Write an expression for the area of this figure.
Write the expression in its simplest form.

Work out the value of this expression when  $x=-6,\ y=4\ and\ z=-1$  

 $\frac{2x^2+yz}{y}+16$  

Use the formula $P=2\left(l+b\right)$  to work out  $b$  when  $P=14\ and\ l=3$  

Use the formula $P=2\left(l+b\right)$  to work out  $P$  when  $l=-10\ and\ b=14$  

Factorise 

 $63m^2n+18m^3n$  

Factorise 

 $3xy-y$  

Expand and simplify 

 $\left(x+4\right)\left(x-11\right)$