There are 7 red marbles and 9 blue marbles in a bag. What is the ratio of all marbles in the bag to blue marbles? What is the ratio of red marbles to blue marbles?

Answer to the 1st question is: 16/9 or 16:9 (whichever form you use)

Answer to the 2nd question is: 7/9 or 7:9

Step-by-step explanation:

Key skills needed: Number theory, Ratios, and Fractions

1) Let's look at the first question. A ratio is usually a number of something over a number of another thing. One such example is 5 apples : 4 oranges (or 5 apples/ 4 oranges - whichever form you write in).

2) Now let's look at the 2nd question. The number of red marbles to the number of blue marbles is the ratio we need to find.  

Hope you understood and have a nice day!! :D

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.