Which expression is even for all integers a and b

E)ab + ab

Step-by-step explanation:

The following options are missing:

A)2a + b  

B)ab + 2a  

C)5a + 6b  

D)ab + 2b  

E)ab + ab

An expression is even when f(x) = f(-x). In this case, the arguments are a and b. Let's suppose a = 1, b = 1 and analyze every option:

A) 2a + b = 2*1 + 1 ≠ 2*(-1) + (-1)

B) ab + 2a =  1*1 + 2*1 ≠ (-1)*(-1) + 2*(-1)  

C) 5a + 6b = 5*1 + 6*1 ≠ 5*(-1) + 6*(-1)    

D) ab + 2b = 1*1 + 2*1 ≠ (-1)*(-1) + 2*(-1)  

E) ab + ab = 1*1 + 1*1 = (-1)*(-1) + (-1)*(-1) -> this is satisfied for every integers a and b

answer: 25.4 units

step-by-step explanation: radius = 12.7 units

diameter = twice the radius

diameter = 12.7 x 2

= 25.4

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.