Why is the great pyramid of giza 30 feet shorter?

Which of the following expressions is equivalent to -1/4y - 2 1/4 + 1/2 (4-2y)? a. -3y + 2b. -3 1/2+4c. -4 1/2y+2d. -4 1/2y+2show ur work

Combine like terms. do not forget to use the distributive property to simplify the first term. 2(3y + 5k) - 2k

These factors threaten north americas ecosystems