Find the angle between each of the following pairs of vectors a⃗ =axi^+ayj^ and b⃗ =bxi^+byj^.. ax1= -3.20, ay1= 4.40; bx1= 2.70, by1= -3.10. i know this is dot prodoct but the calculater just keep saying error

If the public debt of a country in 2009 was $10432000000000 and the budget for 2010 was in deficit by $201645000000, what was the public debt in 2010? do not include commas in your answer.

The table shows the distance traveled over time while traveling at a constant speed.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?