The temperature at 7:00 a. m. was 12 °C, and by 7:00 p. m. it had dropped to -10 °C. Which-expression represents the change in temperature?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?