Range=(-40 C,125 C)
C=5/9(F-32)
-40=(5/9)(F-32)
-72=(F-32)
-40=F
125=(5/9)(F-32)
225=(F-32)
257=F
Range (F)=(-40,257)
-40<F<257
The answer is b hope this helps
1 cake cost 5.60÷7=£0.8
so 10 cake costs 10×0.8=£8
5cake costs 5×0.8=£4
12 cake costs 12×0.8=£9.6