**Answer:**

yes

**Step-by-step explanation:**

**Answer:**

there is no way of solving this because the expression does not equal anything.

**Step-by-step explanation:**

The formula is A=bh so b=20 and h=8

so 20*8=160

After one half life it i s 130/2 = 65 g

after another 2 half lives it will be 65*1/2^2 = 16g to nearest gram

**Answer: x = - 12/9 ( the equation is negative)**

**Step-by-step explanation:**

**\frac{5}{3}x+\frac{1}{3}=13+\frac{1}{3}x+\frac{8}{3}x**

**\frac{5}{3}x=3x+\frac{38}{3}**

**\frac{5}{3}x-3x=3x+\frac{38}{3}-3x**

**-\frac{4}{3}x=\frac{38}{3}**

**3\left(-\frac{4}{3}x\right)=\frac{38\cdot \:3}{3}**

**-4x=38**

**\frac{-4x}{-4}=\frac{38}{-4}**

**x=-\frac{19}{2}**