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4 years ago

9

Sam was asked to evaluate the expression 5x+3x+20 for X = 100. Sam's work shown below. Sam's work: 5x+3x+20 = 100 8x+20 = 100 8x

= 80 X = 10 What mistakes did Sam make? Help Sam to answer the question correctly.

2 answers:

choli [55]4 years ago

7 0

<span>Sam had to substitute 100 instead of X

</span><span>5x+3x+20 =
8x + 20 =
8*100 + 20 =
800 + 20 =
820 </span>← answer

nevsk [136]4 years ago

3 0

Answer:

The value of given expression for x=100 is 820.

He should substitute the value of x in the given expression instead of equating it to 100.

Step-by-step explanation:

The given expression is

$5x+3x+20$

Sam want to evaluate the expression 5x+3x+20 for x = 100.

Substitute x=100 in the given expression.

$5(100)+3(100)+20$

$500+300+20$

$820$

The value of given expression for x=100 is 820.

Sam make his mistake in first step. He equate the given expression to 100.

He should substitute the value of x in the given expression instead of equating it to 100.

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