Riley will make a profit of 7.50d+3.25 for walking dogs, where d is the number of dogs walked. How much profit will Riley make if she walks 8 dogs?

Can someone me with this problem i don't understand i need

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²