Please help.

a. 754cm³ (3 s.f.)

b. 415cm² (3 s.f.)

Step-by-step explanation:

Formulas (for easier reference):

Volume of cone: r²

Volume of hemisphere: r³

Surface area of cone without base: rl

Surface area of hemisphere without base: 2r²

We can just apply the formulas for the question:

Volume of toy = ( × 6² × ) + ( × 6³)

                        = 96 + 144

                        = 240

                        = 754cm³ (3 s.f.)

Surface area of toy = ( × 6 × 10) + (2 × × 6²)

                                = 60 + 72

                                = 132

                                = 415cm² (3 s.f.)

answer: 15

step-by-step explanation:

yes

step-by-step explanation:

they have to be opposite and reciprocal of eachother.