// JavaScript Document

function alertwiththr() {
  var rhr = prompt("What is your resting heart rate?", "")
  var age  = prompt("What is your age?", "")
  var tot = 220 - +rhr+ - age
  var lowfinal = tot *.7 +  +rhr
  var hifinal = tot *.9 + +rhr
  alert("Your target heart rate is between" +" "+lowfinal+" "+ "and"+" " +hifinal)
}