SOLUTION: r=2 s=5 t=.5 Write the following algebraic expression. Then evaluate the expression for the values given above. t times the sum of four times s and r

Question 69036: r=2 s=5 t=.5
Write the following algebraic expression.
Then evaluate the expression for the values given above.

t times the sum of four times s and r

Answer by bucky(2189) (Show Source): You can put this solution on YOUR website!
Four times s is 4s.
Therefore, the sum of 4 times s and r is (4s + r)
The parentheses are used to make it clear that you are dealing with the sum. You are asked to multiply the sum by t.
t times this sum is t*(4s+r)
This is the algebraic expression you were asked to find.
Evaluate the expression by substituting 2 for r, 5 for s, and 0.5 for t to get:
0.5 * (4*5 + 2)
Inside the parentheses first do the multiplication 4 times 5. Then add 2 to that answer. 4*5 is 20 and adding 2 results in 22. Substitute 22 into the expression in place of (4*5 + 2) to get:
0.5 * 22
And 0.5 * 22 = 11
The answer to the evaluation for the given values of r, s, and t is 11
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