Question

Pls help!!

Answer 1

Answer:

Perimeter = 17a

Area = 30 square meters

Step-by-step explanation:

Perimeter = 2b + 8 = 10b + 5 + a = 15ab + 2a - b = 17a

Area = 2 + 8 = 10 + 2 = 12 × 5 = 60 simplify

I honestly don't know if this is correct, I hope it is

Answer 2

Answer:

P = 36 cm.   A = 36$\sqrt{3}$  sq. cm.   or 60.62

Step-by-step explanation:

Equilateral triangle (all sides are =)

2b + 8 =  2a - b                   a + 5 = 2a - b

       8 = 2a - 3b                        5 = a - b

Solving as a system of equation  

    8 = 2a - 3b        Do not change

    5 =   a - b           Multiply by -3

   8 = 2a - 3b

-15 = -3a +3b

   7 = a          

 Solve for b:  8 = 2a - 3b        

                      8 = 2(7) - 3b

                      8 = 14 - 3b

                      -6 = -3b

                       2 = b

What is the length of a side : 2(b) +8 = 2(2) + 8 ;  4 + 8 = 12

                                                  a + 5 = 7 + 5  = 12

                                                  2a - b = 2(7) - 2; 14 - 2 =12

P = 3 (sides); P = 3 (12); P = 36 cm.

A = 1/2bh , in this equilateral triangle the sides are 12 cm. So the base of the triangle is  12 and the height is 6$\sqrt{3}$.   ( draw the height from point A to the midpoint of CB, and you have a 60 30-90 Δ    Long leg equal short leg $\sqrt{3}$.      A = 1/2 (12)(6$\sqrt{3}$) ;  A = 6(6$\sqrt{3}$) ;  A = 36$\sqrt{3}$ square cm