Question

write this in algebraic expression.

1. fifteen less than twice Mary's points

2. twenty more dollars than three times the amount Amalia has

3. Kevin has 16 baseball cards and gets 5 cards from each of his friend

Answer 1

think of each of these people's names as "Y". now, what does the expression "twice" mean in terms of x?

Answer 2

1. 2x-15

Answer 3

Is that correct?

Answer 4

yep

Answer 5

now number 2

Answer 6

2. 20 - 3x ?

Answer 7

make sure to put x first, and watch your signs

Answer 8

you're not subtracting 3x, you're adding it

Answer 9

oh sorry 20 + 3x?

Answer 10

yep.

Answer 11

now number 3

Answer 12

3. 16 + 5x

Answer 13

yep, correct. Just remember though, that you put x first when writing slope-intercept form. But that's correct nonetheless.

Answer 14

ok thank you one question though.

one inch is equal to 2.54 centimeters

a) write an expression to find the number in any number of inches

Answer 15

i don't get it.