No more than means the number or less.
For example, no more than five could be 1, 2, 3, 4, or 5 but no higher. It couldn't be 6, 7 or 8 etc.
that's right, but to added on -1, -2, -3, -4, or -5 can be too.
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They mean that the expression to the left of the sign is greater than or less than (as appropriate) the expression to the right of the sign.
Tangent, in geometry, is used to describe when figures have only one point in common. In Trig. tangent is applied to triangles.
For A+ (more poignant)
Typically, delta means "change in" in math.
This term most likely refers to a multiple-vortex tornado. A tornado is itself a vortex that can sometimes contain two or more smaller vortices that move with the tornado's rotation. These vortices pack stronger winds than the rest of the tornado, and often result in areas within a tornado's path where damage is more severe than it is elsewhere.