The formula for calculating the cost in pounds (C) of a quarterly gas bill is C= 0.06n + 7.5, where n is the number of units of gas used.

a) What is the fixed cost er quarter charged by the gas supplier?
b) What is the cost per unit?
c) José uses 760 units of gas. How much will he have to pay?
d) Rearrange the formula to make n the subject.
e) Tracy's gas bill is £40.50. How many units of gas did she use?

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Someone answer this check out the image!

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?