Joys age is x
x + (x-4) = 74
2x = 78
x = 39
joy is 39 years old
To compress horizontally means you multiply the scale factor by "x"
Raising a number to the 1/2 power means taking its square root.
Each "ordered pair" describes one point on the graph. It's a pair of numbers.
-- The first number is the 'x'-coordinate of the point ... it tells how far the point
is left or right of the center.
-- The second number is the 'y'-coordinate of the point ... it tells how far the
point is up or down from the center.
-- With that much information, you can find any point on an infinite piece of
paper that has no ends. You only need an ordered pair of numbers, and
you need to know where the center of left-right is, and where the center of
up-down is. Those lines are always drawn on the graph before you start
marking your ordered pairs.
The class has 28 student. One group has four more students so surat 4 from 28. 28-4=24 since one of the groups have twice as many students as the other divide 24 by 3. 24 / 3 = 8. It says 1 group has for more than twice the other group so that would mean 2/3 of 24 and 4 would be the answer 16+4=20. The first group had 8 students, the other group has 20 students.
