The isosceles triangle has a perimeter of 7.5 m. Which equation can be used to find the value of x if the
shortest side, y, measures 2.1 m?

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The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.