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Answer: 1.25
Step-by-step explanation: $15/$12= $1.25
$25/$20= $1.25
$35/$28=$1.25
To find constant proportionality you do your x value divided by your y value hoped this helped!
2 + 4 + 8 + 16 + 32 +64 + 128 + 256 + 512 + 1024 + 2048 + 4096 = 8190
You also happen to be the luckiest kid in the world to have such rich parents to give such a high allowance.