Help plz. full working out

£ 186.20

Step-by-step explanation:

height = 6 cm = 0.06 m

Volume of gravel drive away = length * width * height

            = 11 * 4 * 0.06

           = 2.64 m³

Number of gravel bags needed = 2.64 ÷ 0.4

                                                      = 6.6

7 bags are to be purchased by him.

Cost of a bag = £ 38

Cost of 7 bags = 38 * 7 = £ 266

Discount = 30% of 266

                    = £ 79.80

Amount paid by Martin = 266 - 79.80

                                      = £ 186.20

3030 ur welcome

step-by-step explanation:

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584