What is 4.2x10^10/ 3x10^3 simplified

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints