Which of the following is equivalent to 5^-9

What are the soultion(s) to the quadratic equation 40- x^2=0

Afarmer sells 9.5 kilograms of apples and pears at the farmer's market. 4/5 of the weight is the apples and the rest is the pears. how many kilograms of pears did she sell at the farmers market

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week