The number is the load rating. Common car tyres range from about 87 (small car, light load) to 97 (larger car, heavier load) but can go from 71 (345kg) - 110 (1060kg).
The letter is the speed index. Y is currently the highest available, tested up to 300km/h. More common indices are H (210km/h) & V (240 km/h).
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If you mean 28 = 7+y then the solution of the equation is y = 21
If you mean: y = x and y = x+2 then the lines are then parallel to each
mean(5.2 + 8.3 + 8.5 + 7.7 + 7.8 + y) = 7.1=> y = 5.1
In mathematics, the notation "y3" typically represents the cube of the variable "y," which is equivalent to y * y * y. This is a shorthand way of denoting the result of multiplying y by itself three times. The cube of a number is the number raised to the power of 3.
the distance between x and y