Which sentence does not belong

a. x+12=12+x

b. 7h=h•7

c. 1+a=a+1

d. n:2=2:n

Is 0.121221222 ... rational or irrational?

Joan buys cans of beans in bulk. She buys 3 cases of beans for a total of $23.15. Each case contains 6 cans of beans.

Prove the following trigonometric identity 2/square root of 3 cosx + sinx = sec (pi/6 - x)

Marcus is 1.5 meters tall. His sister is 0.1 meter taller than Marcus. Their father is 0.2 meter taller than his sister. How tall is their father?

Simplify 5 + 5i / 2-i?

Which is the quotient of 3.12:6.5 a 0.0 48B 0.48C 4.8 D 48

If a integer greater than four is raised to one half power, we are finding ... -the cube root of the number -the square root of the number -the opposite of the number -the number divided by two

4 5/8 + 2/3 whats is the answer

What is 2 (*+6) + 2 if x=-2.

Is 0.5 liters bigger than 400 milliliters?