Initially, the economy is in long-run equilibrium. The aggregate demand curve then shifts $80 billion to the left. The government wants to change spending to offset this decrease in demand. The MPC is 0.75. Suppose the effect on aggregate demand of a tax change is 3/4 as strong as the effect of a change in government expenditure. There is no crowding out and no accelerator effect. Suppose the government raises tax by an amount of y. How does that translate into the change on aggregate demand

The 40th parallel of north latitude runs across the united states through philadelphia, indianapolis, and denver. at this latitude, earth’s radius is about 3030 miles. the earth rotates with an angular velocity of latex: \frac{\pi}{12} π 12 radians (or 15°) per hour toward the east. if a jet flies due west with the same angular velocity relative to the ground at the equinox, the sun as viewed from the jet will stop in the sky. how fast in miles per hour would the jet have to travel west at the 40th parallel for this to happen? show your work and explain your process.