A(n) is a statement deemed to be obviously true.

The answer is Axiom.

Step-by-step explanation:

A(n) axiom is a statement deemed to be obviously true.

An axiom is a statement or principle that requires no proof because its truth is obvious.

One of the example of an obvious axiom is the principle of contradiction, that states that a statement and its opposite cannot both be true at the same time and place.

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

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