Answer:
first get the total ratio; 2 + 5 = 7
so the fraction of blue marbles is 5/7
then assume the number of total marbles to be k
then use the expression;
5/7*k = 65
7*5/7 * k = 65*7
5k =455
5/5k = 455/5
k = 91
then calculate the number if red marbles from;
x = 2/7*91
x = 26
Therefore there are 26 red marbles.
Answer:
C
Step-by-step explanation:
D is a geometric sequence.
Answer:
10 = 3 and 4
11 = 11 and 12
12 = 8 and 9
13 = 17 and 18
Step-by-step explanation:
