SOLUTION: I need help with 6 questions. 1.Evaluate 5∙2^2÷2+8 2.Evaluate (6^4÷3^2)/12 3.What is the value of the expression when c=-1 and d=16 3c^2+d/2 4.What is the value of t

Algebra ->  Expressions-with-variables -> SOLUTION: I need help with 6 questions. 1.Evaluate 5∙2^2÷2+8 2.Evaluate (6^4÷3^2)/12 3.What is the value of the expression when c=-1 and d=16 3c^2+d/2 4.What is the value of t      Log On


   

Question 1049136: I need help with 6 questions.
1.Evaluate 5∙2^2÷2+8
2.Evaluate (6^4÷3^2)/12
3.What is the value of the expression when c=-1 and d=16 3c^2+d/2
4.What is the value of the expression when x=5 and y=-2 (5x+2y)/(x-2)
5.Miss Griggs ran at a rate of 3 mph for 2.5 hours. If d=rt, where d is distance, r is rate, and t is time, find how far Miss Griggs ran. Show all your work.
6.Is n=7 a solution to the equation 6=2n-8? Show your work to prove your answer.

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
#3
Just substitute the given values and evaluate the expression.

#2 and #1
PEMDAS Order of operations



Look inside parentheses first. Do the exponentiations:
Actually, I would make use of the indicated rational stuff there and simplify first.
%28%28%282%2A2%2A3%2A3%29%5E4%29%2F%283%5E2%29%29%2F12

%28%282%5E4%2A3%5E4%29%2F%283%5E2%29%29%2F12

%282%5E4%29%283%5E2%29%2F12

%282%5E4%2A3%5E2%29%2F%282%5E2%2A3%29

2%5E2%2A3

highlight%2812%29-----------result for #2.


#1
Multiplications from left to right: 5%2A4%2F2%2B8
20%2F2%2B8
Divisions from left to right, only one of them: 10%2B8
ADDITIONS from left to right: highlight%2818%29


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WHAT ABOUT #4, #5, #6?

#4
Substitute the GIVEN values for x and y. EVALUATE the expression. Not much different than #3; same idea, similar method.

#5
You have the formula. Substitute the values and evaluate. The units will give no complications.

#6
Is 6=2%2A7-8 true or false?