The gateway arch in st. louis, missouri, weighs about 20,000 tons. which amount could be the exact number of tons the arch weighs?

The ratio of blue cards to green cards is 2 to 5. there are 8 blue cards. complete the diagram and explain how you can find the number of green cards.

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

`if you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain. ''.