Questions in mathematics

Questions in mathematics

[Done] If you multiply me by 2, I become a number greater than 20 and less than 40. Who am I?

[Done] Is the sum of \(\frac{9}{10}\) and \(\frac{1}{32}\) less than or greater than 1?

[Done] What is the simplest form of the product? SqRt 63x^5y^3 • sqRt 14xy8

[Done] If \( n \) is even, which of the following cannot be odd? A. \( n + 3 \) B. \( 3n \) C. \( n^2 - 1 \) Please explain with some details.

[Done] Solve the equation by completing the square: \[ m^2 + 2m - 48 = -6 \]

[Done] Colin is buying dirt to fill a garden bed that is a 9 ft by 16 ft rectangle. If he wants to fill it to a depth of 4 in., how many cubic yards of dirt does he need? If dirt costs $25 per cubic yard, how much will the project cost? (Note: 1 cubic yard = 27 cubic feet) The answer I got is $1600. Correct me if I'm wrong.

[Done] An airplane flew for 8 hours at an airspeed of \( x \) miles per hour (mph) and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the following equations could be used to find \( x \)? A. \( x + 325 = 2(350) \) B. \( x + 7(325) = 15(350) \) C. \( 8x - 7(325) = 350 \) D. \( 8x + 7(325) = 2(350) \) E. \( 8x + 7(325) = 15(350) \)

[Done] Place \( \frac{5}{6} \) on a number line.

[Done] Are all diagonals also lines of symmetry? Can you explain why?

[Done] The sum of three numbers is -44.84. One of the numbers is 24.6. The other two numbers are equal to each other. What is the value of the other two numbers?