Mel is 21......................................
2m+2n+7 is the correct answer
Answer:
12345
Step-by-step explanation:
To find out the surface area of a triangular pyramid you have to do 14 x 24 then divide by 2 which gives you 168 then you'll do 8 times 6.9 then divide by 2 which will give you 27.6 which when you add 168+27.6, you'll get 195.