3a + 3b
combine like terms: a+a+a=3a
b+b+b=3b
3a +3b
Answer:
27648inches÷64inches=432 tiles
Step-by-step explanation:tiles cost 3456
Answer:
A' = 6(3t +1)
Step-by-step explanation:
The area is the square of the side length, so ...
A = (3t +1)²
The derivative with respect to t is then
A' = 2(3t +1)·(3) = 6(3t +1)
If you like, you can multiply out the area expression first, then differentiate.
A = 9t² +6t +1
A' = 18t +6
This can be factored, if you like, to ...
A' = 6(3t +1)
Total is 1120
interest is 3.5
interest earn in 1 yr be p
so is p/ 100 × 3.5 ×4 = 1120
1120÷4= p/100x 3.5
280=p/100 x 3.5
280÷3.5= p/100
80=p/100
p= 8000