Commercial gasoline is 10% ethanol and 90% gasoline. E-85 is 85% ethanol and 15%
gasoline.
How much commercial gasoline needs to be combined with 3800 gallons of pure 100% ethanol to create a mix that is 85% ethanol & 15% gasoline?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?