Answer:
only 3.5 buy products made with recycled material but you have to round it to 4
I assume you mean
2 tonnes of sand
at £75.00 per tonne
20 bags of cement
at £6.70 per bag
350 bricks at 45p each
If so, then
2 tonnes of sand
at £75.00 per tonne = 2 * £75.00 = £150.00
20 bags of cement
at £6.70 per bag = 20 * £6.70 = £134.00
350 bricks at 45p each = 350 * £0.45 = £157.50
Add the three amounts
£150.00 + £134.00 + £157.50 = £441.50
Answer: 441.50
The Slope-Intercept form of the equation of the line is:

Where "m" is the slope of the line and "b" is the y-intercept.
The slope can be found with:

Choose two points from the table. These could be the points (1,-4) and (4,-19). You can set up that:

Substituting values, you get that the slope of this line is:

You can substitute the slope and the first point into the equation in Slope-Intercept form:

Solve for "b":

Therefore, the Equation of this line in Slope-Intercept form is:
8000 + 300 + 70 + 4 + 0.2 + 0.01