Answer:
12.6 square inches
Step-by-step explanation:
A=(1/2)bh
A=(1/2)12*2.1
A=12.6 square inches
1. multiply the first term of each binomials together
2. multiply the out terms together.
3. multiply the inner terms together
4. multiply the last terms of each expression together
5. list the four results of FOIL in order
6. combine the like terms.
I hope this helps
Answer:

Step-by-step explanation:
Here first open the inner parentheses and use the distributive property,

First, u multiply 8x3. Only the 4 can go in the ones place so put the four beneath the line and put the 2 over the 7.
Multiply 8x7 and add 2.
Move to the tens place, do 2x3 then 2x7.
Add the products and put the comma. Then ur done