all of the chicken is/ are gone

the cow and the pig is / are

\(10^1\times10^1\times10^8=10^{1+1+8}=10^{10}\)

  55 x 2 ² x 5 + 4 x 89 x 5² - 3² x 10³

= 25 x 4 x 11 + 4 x 25 x 89 - 90 x 100

= 100 x 11 + 100 x 89 - 100 x 90

= 100 x (11 + 89 - 90)

= 100 x 10

= 1000

31 x 15 x 72 x 4 - 31 x 49 x 40

=31 x 15 x 49 x 4 - 31 x 49 x 40

=31 x 49 (15 x 4 - 40)

=31 x 49 x 20

=30380

\(\left(x-16\right)=144:24\)

\(x-16=6\)

\(x=22\)

\(5^{8+3}=5^{11}\)    

\(9^7:8^0=9^7:1=9^7\)

\(\left(2^{10}:2^6\right)\times4^2=2^{10-6}\times4^2=2^4\times4^2=2^4\times2^4=2^{4+4}=2^8\)

\(a\left(x-1\right)^2=x^2-2x+1\)

\(b\left(3-y\right)^2=9-6y+y^2\)

\(c\left(x-\dfrac{1}{2}\right)^2=x^2-x+\dfrac{1}{4}\)

a 7^12-4 = 7⁸

b x^6-3 = x³

c x^5-5 = x⁰ = 1(x ≠ 0)

d 10^8-2 = 10⁶

e a^6-1 = a⁵

g 3^10+8-3 = 3¹⁵

\(a,\left(0.8\times1.25\right)\times2.5=1\times2.5=2.5\)

\(b,\left(4\times2.5\right)\times5.6=10\times5.6=56\)