Mary, who is sixteen years old, is four times as old as her brother. how old will mary be when she is twice as old as her brother? explained

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?