Joan has 100 marbles. mary has m marbles. if joan has 25 times as many marbles as mary, write an equation that shows how many marbles mary has

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

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.