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i have a comment box in HTML, and whenever i type some words and click submit it goes to send the email but between the words i get plus signs for example this+is+an+example is there code I can insert to stop this?

the growth rate of a certain tree (in feet) is given by: y= 2/t+2 + e^-t^ ²/² where t is time in years. find the total growth from t=1 to t=7 by using n=12 with the following methods a) the trapezoidal rule b) simpsons rule