these muscle groups either extend a joint, extensors) or contract the joint (flexors).
triceps extend the elbow joint, biceps bend the elbow joint.
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explain why a function has at most one y-intercept
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There is no step function in Excel. However, you can use excel to create a Step Function Chart. See related links for a video to explain the process.
y² = x --> y = ±√x Because there are *two* square roots for any positive number (positive and negative) this will not be a function.