1. Solve for the unknown using principles of equations.

a. 10x+63x=5x15+x10x+63x=5x15+x

Round to two decimal places

b. x37x=2x8+6xx37x=2x8+6x

Round to two decimal places

2. 0.03(16x)+0.15(x+0.6),wherex=70.03(16x)+0.15(x+0.6),wherex=7

3. Find the length of the second parallel side of a trapezoid whose first parallel side is 26 cm, whose height is 16 cm, and whose area is 368 cm.

? =cm

4. Write the algebraic expression for the following:

a. The sum of a number and ten, is six.The sum of a number and ten, is six.

x+6=10

x+10=6

x=6+10

b. A number times seventy-two, is six.A number times seventy-two, is six.

726=x

72x=6

6x=72

c. A number divided by four, is five.A number divided by four, is five.

5/4=x

x/4=5

5/x=4

d. The product of twelve and a number, is two-thirds.The product of twelve and a number, is two-thirds.

12(x/3)=2

12x=2/3

12(2/3)=x