Answer:
29
Step-by-step explanation:
make Mark x and Tony 3x + 5
X+3x+5=121
The number of baseball cards in between Tony and Mark is a linear equation, where Mark has 29 cards.
A linear equation is an equation where the variable has the highest power of one. A linear equation may be consists of multiple variables.
Let, Mark has x cards.
Therefore, Tony has (3 × x + 5) cards = (3x + 5) cards.
Given, x+ 3x + 5 = 121
⇒ 4x +5 = 121
⇒ 4x = 121 - 5
⇒ 4x = 116
⇒ x = 116 / 4
⇒ x = 29
Hence, Mark has 29 cards.
Learn more about linear equation here: https://brainly.com/question/21835898
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