Hey friend let me answer the last question,Rest all questions you can ask separately..

Refer to the attachment

Remember to follow your promise and mark as brainliest answer..

Hope that helps you..

Answer:

25. a=25 years b=20 years c= 10 years

26. 12sq units

27.y=10+6(x-1)

for the last one(28) you must draw the graph

hope this helps you pls mark me as brainliest:)

Step-by-step explanation: