Answer:The first two should be checked and the last two should be checked. only the middle one should not be checked
Step-by-step explanation:
a door is a rectangle so it takes all the properties of a rectangle.
Step-by-step explanation:
a1 = 2
a2 = a1 + 9 = 2 + 9 = 11
a3 = a2 + 9 = 20
a4 = a3 + 9 = 29
a5 = a4 + 9 = 38
a6 = a5 + 9 = 47
Assuming those 'x's mean multiply, the missing term is 5
So we go from this
(2x4) x ?? = 2x(4x5)
to this
(2x4) x 5 = 2x(4x5)
where the question marks have been replaced with 5
The rule to use is the associative property of multiplication. It's the idea where we can group three values in two ways to multiply in any order. Either we do 2 times 4 first, or we do 4 times 5 first. It leads to the same answer. This idea is similar to the commutative rule but it's not exactly the same.