Answer:
57
Step-by-step explanation:
first do what is in the brackets then the parentheses, then multiply the 3
I don't think you're stupid. ^^
Let's take the third term, 8. If n=3, then an should be 8.
The first answer gives 15+2.5*3=22.5.
The second answer gives 15.5+2.5=23.
The third answer gives 15-2.5*3=7.5.
The fourth answer gives 15.5-2.5*3=8.
Choice 4 is correct.
Let's try to actually find the equation on our own.
The equation for an arithmetic series is an=a0+dn where a0 is the term that comes before the first term.
The first term given is 13 and it decreases by 2.5 each time so n=-2.5 and the term that would be before 13 is 15.5.
Thus the equation is an=15.5-2.5n
Answer:
I believe the answer is D.
Step-by-step explanation:
The question is: What fractions of the beads are blue or green ?
The answer is: <em>7/12 of the beads</em> are either blue or green.
D 48! Explanation: 12x4= 48 because the square has 4 sides
