use xrefs for "story also appears in"

[rhinopotamus]

Ok here is a list:

Weight change

• 0.7 problem 1: xml:id="weight-change-algebraic-notation"
• 0.4 problem 3 xml:id="weight-change-order-operations"
• 4.3 problem 3 xml:id="weight-change-intercepts"

wooden balls

• 0.6 problem 1: xml:id="wooden-balls-powers-roots"
• 0.7 problem 2: xml:id="wooden-balls-algebraic-notation"

Astra rent

• 0.6 problem 3: xml:id="astra-rent-algebraic-notation"
• 0.3 problem 2: xml:id="astra-rent-percentages"
• 0.9 problem 4: xml:id="astra-rent-logarithms"

Rose gold

• 0.6 problem 4: xml:id="rose-gold-algebraic-notation"
• 0.4 problem 2 xml:id="rose-gold-order-operations"
• 2.3 problem 2 xml:id="rose-gold-using-equations"
• 4.1 exercises

Pizza diameter

• 2.4 problem 1: xml:id="pizza-diameter-approx-solutions"
• 3.3 problem 1 xml:id="pizza-diameter-solving-power"
• 4.1 problem 3 xml:id="pizza-diameter-modeling-linear"
• 0.6 problem 2 xml:id="pizza-diameter-powers-roots"

Fuel tank for 350 range

• 2.4 problem 2: xml:id="fuel-350-approx-solutions"
• 3.3 problem 3 xml:id="fuel-350-solving-power"

Monty orchids

• 2.4 problem 3: xml:id="monty-orchids-approx-solutions"
• 2.3 problem 3 xml:id="monty-orchids-using-equations"

Truck hauling grass seed

• 0.2 problem?: xml:id="truck-grass-arithmetic-operations"
• 2.1 problem 1 xml:id="truck-grass-first-look-linear"
• 3.2 problem 1 xml:id="truck-grass-linear-ineq"
• 3.1 problem 1 xml:id="truck-grass-solving-linear"

bunnies

• 0.8 problem 3: xml:id="bunnies-prelude-scientific-notation"
• 2.2 problem 2 : xml:id="bunnies-first-look-exponential"
• 5.1 problem 3: xml:id="bunnies-modeling-exponential"

flu in dorms

• 2.2 problem 3 : xml:id="flu-dorm-first-look-exponential"
• 5.1 problem 2: xml:id="flu-dorm-modeling-exponential"
• 5.5 textbook

reservoir rain

• 2.1 problem 2 : xml:id="reservoir-rain-first-look-linear"
• 3.2 exercises
• 4.1 problem 3 xml:id="reservoir-rain-modeling-linear"

line of credit

• 2.2 problem?: xml:id="credit-line-first-look-linear"
• 3.2 exercises

Juan coffee

• 0.4 problem 1 xml:id="juan-coffee-order-operations"
• 2.1 problem 4 xml:id="juan-coffee-first-look-linear"
• 1.2 problem 4 xml:id="juan-coffee-tables-graphs"
• 4.2 problem 2 xml:id="juan-coffee-systems-linear"

grandfather bonds

• 5.3 problem 1 xml:id="grandfather-bonds-growth-factor"
• 1.2 problem 1 xml:id="grandfather-bonds-tables-graphs"
• 4.1 problem 3 xml:id="grandfather-bonds-modeling-linear"

reality tv

• 5.3 problem? xml:id="reality-tv-growth-factor"
• 5.1 exercises

chlorine pool

• 5.3 problem 3 xml:id="chlorine-pool-growth-factor"
• 3.4 problem 2 xml:id="chlorine-pool-solving-exponential"

angry birds

• 5.3 problem? xml:id="angry-birds-growth-factor"
• 5.1 exercises

solar heating

• 4.1 1 : xml:id="solar-heating-modeling-linear"

wind chill

• 1.2 problem 2 xml:id="wind-chill-tables-graphs"
• 4.1 problem 3 xml:id="wind-chill-modeling-linear"

plumber rates

• 4.1 problem? xml:id="plumber-rates-modeling-linear"
• 2.1 exercises

savings interest

• 0.3 problem 4 xml:id="savings-interest-percentages"
• 2.2 problem 4 xml:id="savings-interest-first-look-exponential"

anthony and christina wedding

• 1.2 problem 3 xml:id="wedding-rental-tables-graphs"
• 1.3 problem 2 xml:id="wedding-rental-rate-of-change"
• 3.2 problem 3 xml:id="wedding-rental-linear-ineq"

US GDP

• 0.8 problem 1: xml:id="gdp-prelude-scientific-notation"
• 1.5 problem 1 xml:id="gdp-scientific-notation"

earth weight

• 0.8 problem 1: xml:id="earth-weight-prelude-scientific-notation"
• 1.5 problem 3 xml:id="planet-weight-scientific-notation"

dust particle

• 0.8 problem 2: xml:id="dust-particle-prelude-scientific-notation"
• 1.5 problem 2: xml:id="dust-particle-scientific-notation"

proton mass

• 0.8 problem 2: xml:id="proton-mass-prelude-scientific-notation"
• 1.5 number 7

fiber optic signals

• 0.8 problem 2: xml:id="fiber-optic-prelude-scientific-notation"
• 5.2 problem 1: xml:id="fiber-optic-growth-decay"

currency

• 0.8 problem 4: xml:id="currency-prelude-scientific-notation"
• 0.1 problem 4 xml:id="currency-approx-round"

world population

• 0.8 problem 4: xml:id="world-population-prelude-scientific-notation"
• 0.3 problem 1 xml:id="world-population-percentages"

stephen bac

• 3.4 problem 1: xml:id="bac-solving-exponential"
• 1.1 problem 4 xml:id="bac-variables-functions"
• 2.4 exercises

riverside rent

• 3.4 problem 3: xml:id="riverside-rent-solving-exponential"
• 1.1 problem 2 xml:id="riverside-rent-variables-functions"

mortgage payoff

• 3.4 problem 4: xml:id="mortgage-payoff-solving-exponential"
• 2.3 problem 1 xml:id="mortgage-payoff-using-equations"

burger temp

• 3.1 problem 4 xml:id="burger-temp-solving-linear"
• 2.1 exercises

gravel path

• 3.5 problem 4 xml:id="gravel-path-quadratic"
• 2.3 exercises
• 2.4 exercises

shrub growth

• 4.1 exercises
• 4.2 problem 3: xml:id="shrub-growth-systems-linear"