Step-by-step explanation:
What is knownAC=75 AB=4 times BC AB+BC=AC
4(BC)+BC=75 Add like numbers
4(BC)+BC=5BC
5(BC)=75 get the variable(BC) alone by dividing both sides by the number(5)
5(BC)/5=75/5 Then simplify5(BC)/5=(BC) and 75/7=15
(BC)=15
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step-by-step explanation:
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