Sn=n/2[2a+(n-1)d]
s7 means n=7
a7=7/2[2(13)+(7-1)(3)]=7/2(44)=154
Ans:C
Answer:
5y+11
Step-by-step explanation:
y+3+4(y+2)
Use the distributive property to multiply 4 by y+2.
y+3+4y+8
Combine y and 4y to get 5y.
5y+3+8
Add 3 and 8 to get 11.
Answer:
Step-by-step explanation:
<u>Use formula:</u>
- A = 1/2 Pa, where P-perimeter of the polygon, a- apothem
1)
- A = 1/2(7*13.9)(14.4) = 700.56 ≈ 700.6
Correct choice is B
2)
Correct choice is A
Since 83-59=24, 83 is added by 28 so your answer would be 111.
