Jackie's broker charges her a commission of $8.25 per ten of stocks she buys or sells. if jackie buys 69 shares of alesia insurance at $10.34 per share, how much will jackie spend in commission?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?