Solve the following system of linear equations by substitution. show all of your steps, and type your final answer in (x, y) form: x + 3y = 5 and 4x + 5y = 13

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .