A=1/2*h(20+8)
can you solve for h or the equation .

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation : 

                     a-(1/2*h*(20+8))=0 

 3.1     Solve   a-14h  = 0 

Tiger recognizes that we have here an equation of a straight line. Such an equation is usually written y=mx+b ("y=mx+c" in the UK). 

"y=mx+b" is the formula of a straight line drawn on Cartesian coordinate system in which "y" is the vertical axis and "x" the horizontal axis.

In this formula :

y tells us how far up the line goes
x tells us how far along
m is the Slope or Gradient i.e. how steep the line is
b is the Y-intercept i.e. where the line crosses the Y axis

The X and Y intercepts and the Slope are called the line properties. We shall now graph the line  a-14h  = 0 and calculate its properties

Notice that when a = 0 the value of h is 0/-14 so this line "cuts" the h axis at h=-0.00000

When h = 0 the value of a is 0/1 Our line therefore "cuts" the a axis at a= 0.00000

Slope is defined as the change in h divided by the change in a. We note that for a=0, the value of h is 0.000 and for a=2.000, the value of h is 0.143. So, for a change of 2.000 in a (The change in a is sometimes referred to as "RUN") we get a change of 0.143 - 0.000 = 0.143 in h. (The change in h is sometimes referred to as "RISE" and the Slope is m = RISE / RUN)

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!

the battle of gettysburg is considered the "high water mark" of the confederacy because it marked the greatest advance of the confederate forces against the union.