Simplify 10(0.4x+0.2y)+21(0.6x-0.8y) brainliest

Which statement best describes a square? a. a special rectangle that has four right angles b. a special trapezoid that has four sides of equal length c. a special rectangle that has four sides of equal length d. a special trapezoid that has four right angles

The square root of 9x plus 7 plus the square rot of 2x equall to 7

The high temp today was 62°. when nighttime comes, the temp will drop 40°. by 4am the temp will drop an additional 40°. what is the temp at 4am?