Answer:
a = -8
Step-by-step explanation:
you can solve this proportion by cross-multiplying:
4(a + 9) = -1(a + 4)
now distribute to eliminate parentheses
4a + 36 = -1a - 4
5a + 36 = -4
5a = -40
a = -8
Photomath is a good one. So is KhanAcademy, but I don't know if they have an app version of the website.
Answer:
2 cups of sugar
1 cup of butter
4 eggs
Step-by-step explanation:
Multiply the recipe by 2
8 cups of flour