Question

Evaluate the expression 7x2y, when x = 5 and y = 3. (3 points)


210

315

525

728

3.
(06.04)
Evaluate the expression 3.14(a2 + ab) when a = 4 and b = 3. (Input decimals only, such as 12.71, as the answer.) (4 points)

Answer 1

2 different question

Answer 2

@ganeshie8

Answer 3

You need to substitute \(x\) and \(y\) with their respective values. So expression 1 becomes,

\(7x2y=7\times5\times2\times3\)

Answer 4

Do the same thing to the second expression.

Answer 5

hmmm still dont get how you got the oh wait!!!

Answer 6

4x3x2 right?

Answer 7

or 3.14x2x4x3x12.71

Answer 8

Hmm there is one problem. Is this the correct expression,
\(7x^2y\)
and
\(3.14(a^2+ab)\) ?

Answer 9

i already did number 2 its 210

Answer 10

Im looking at 3.

Answer 11

@MARC_D Cause why not

Answer 12

Wait, check the expressions that I typed with those in the book. If it's \(7x^2y\) the answer for the first question is different.

Answer 13

k

Answer 14

I think it is

Answer 15

@Sachintha it is

Answer 16

Which one do you mean by 'it is'? Is it \(7x2y\) or \(7x^2y\) ?

Answer 17

The 2nd ONE

Answer 18

Ohh then it should be as follows,

\(7x^2y=7\times(x\times x)\times y\)

Answer 19

oh ok thx

Answer 20

\(x^2 = x \times x\)
I hope you can do the second one now. :)

Answer 21

Yea i can thx :D

Answer 22

Great! :)