Nancy decides to buy 30 panels for her allotment and her garden. the panels need to be treated with wood preservative. each panel is 1.8 m long and 2 m high. 1 litre tin of wood preservative covers 12 square metres. how many tins will she need?    

The answer is:

She will need 9 tins to cover all the panels.

To find how many tins will she need to cover the 30 panels for her allotment and her garden, we need to calculate the total area of the panels and then, calculate how many tins will she need knowing that each liter of tin, covers 12 square meters.

We are given the dimensions of the panels:

Now, calculating the area of one (1) panel, we have:

So , the total area of all 30 panels is:

Then, calculating how many tins will she need to paint all the panels, we have:

Hence, we have that she will need 9 tins to cover all the panels.

Have a nice day!

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

f(x) = y

f(-3) = -5

step-by-step explanation: