Shopping Spree
You buy x packs of gum. Each pack costs $3. Write a function for the total cost.
3x
You burn 5 calories per jumping jack. Write a function for the calories burned after j jumping jacks.
5j
The sequence 3, 6, 9, 12… follows a pattern. Write a function for the nth term.
3n
If the input is x and the output is 3x + 2, write the function rule.
x --> x3 --> +2 --> 3x+2
I have keys but open no locks. What am I?
Piano / Keyboard
A store sells books for $5 each and pens for $2 each. Write a function for the total cost if you buy b books and p pens.
5b + 2p
A sprinter runs at 6 meters per second. Write a function for the distance d after t seconds.
The sequence 5, 8, 11, 14… follows a rule. Write a function for the nth term.
3n+2
A vending machine gives twice the input number minus 1. Write the function rule.
2x - 1
The more you take, the more you leave behind. What am I?
Footsteps
A toy costs $x, but there’s a 20% discount. Write a function for the discounted price.
0.2x OR (x/100)*20
A swimmer completes x laps per minute. Write a function for the total laps after t minutes.
xt
A staircase has 5 steps, and each step is 2 cm taller than the last. Write a function for the height of step n.
2n+3
A function takes a number, multiplies it by 4, then subtracts 7. Write the function rule.
4x - 7
I am full of holes but still hold water. What am I?
Sponge
You have $50. You buy x candy bars, each costing $2.50. Write a function for the money left.
50 - 2.50x
You do 10 push-ups every morning and increase by 2 push-ups per week. Write a function for the total push-ups in w weeks.
2w + 10
A factory produces 20 items per day, starting with 50 items on day 1. Write a function for the total items after d days.
20n+30
The input x is squared and then divided by 2. Write the function rule.
x² ÷ 2
I am an odd number. Take away one letter, and I become even. What number am I?
(S)even
A shirt costs $x and pants cost 3 times as much as a shirt. Write a function for the total price of s shirts and p pants.
sx+ 3px
A cyclist bikes 4 km in the first hour and increases their speed by 2 km every hour. Write a function for the total distance after h hours.
4 + 2h
A farmer plants 10 trees in the first row and adds 3 more trees per row. Write a function for the trees in row n.
3n+7
The function machine first adds 10 to the input, then triples the result. Write the function rule.
3 (x+10)
Forward, I am heavy. Backward, I’m not. What am I?