How many african countries does the tropic of cancer cross

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

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]

Which phrases apply to metamorphic rocks? check all that apply. form under extreme heat and pressure form from existing rocks form from magma and lava form when sediments combine form from volcanic eruptions