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A student has scores of 73, 75, and 84 on his first three tests. He needs an average of at least 80 to earn a grade of B in the class. What is the minimum score that the student needs on the fourth test to ensure a B?

The student needs a minimum score of
on the fourth test to ensure a grade of at least a B.
Question HelpQuestion 28: Video1

Respuesta :

27pengj

Answer:

88%

Step-by-step explanation:

(73+75+84+x)/4=80

x4 to both sides

73+75+84+x=80x4

73+75+84+x=320

232+x=320

x=320-232

x=88

Answer:

88

Step-by-step explanation:

80*4 = 320   320- (73 + 75 +84 ) = 88    we  can cross out 320/80 = 32/8 and 232/320  = 232 /4   (320/4) and divide each side by 4 = 58 / 80 then 29/40 = 40-29 = 11 then decimalise  /10 = 1.1   then multiply 80 * 1.1 = 88