How to solve the length of a side of a figure?

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t