Mary is 21 years old. her age is 9 years more than 3 times henry’s age. which equation can be used to determine x, henry’s age in years?

The avenues in a particular city run north to south and are numbered consecutively with 1st avenue at the western border of the city. the streets in the city run east to west and are numbered consecutively with 1st street at the southern border of the city. for a festival, the city is not allowing cars to park in a rectangular region bordered by 5th avenue to the west. 9th avenue to the east, 4th street to the south, and 6th street to the north. if x is the avenue number and yis the street number, which of the following systems describes the region in which cars are not allowed to park? 5th ave 9th ave

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?