Write down five major inventions that improved agricultural output between 1750 and 1870.

1790sCradle and scythe introduced; invention of cotton gin (1793); Thomas Jefferson's plow with moldboard of least resistance tested (1794)
1793Eli Whitney invents the cotton gin, which contributes to the success of cotton as a Southern cash crop
1797Charles Newbold patents first cast-iron plow
 1800
1801Thomas Moore of Maryland invents the icebox refrigerator
1819Jethro Wood patents iron plow with interchangeable parts

d

step-by-step explanation:

an inequality is an expression which means more than one number is a solution. we graph the solutions on a number line to show all possible values. we graph using circles and arrows.

equal to and less/greater than are graphed with filled in circles on the value.only less/greater than (not equal to) are graphed with open (not filled in) circles on the value.we draw an arrow the direction the solutions satisfy the inequality. generally this is the direction the inequality itself points.

this is a filled in circle on -2 so this is . this means only answers c and d are options.

answer d points to the right.