Answer: 4(×+1) (×-1)
Step-by-step explanation:
Let volleyball be v and let basketball be b.
v : b = 4 : 7, b = 21
v : 21 = 4 : 7
v/21 = 4/7
7*v = 4*21
v = 4*21/7
v = 4*3
v = 12
Volleyballs are 12
Hope this helps.
Answer: 120 beats per 45 seconds
Step-by-step explanation:
Answer:
<h3> 10,450</h3>
Step-by-step explanation:
21-13=8 and 29-21=8
So this is aritmetic series where a₁ = 13, and r = 8
Sum of the first n terms:
![S_n=\dfrac{a_1+a_n}{2}\cdot n=\dfrac{a_1+a_1+(n-1)r}{2}\cdot n=\dfrac{2a_1+(n-1)r}{2}\cdot n\\\\\\S_{50}=\dfrac{2\cdot13+(50-1)\cdot8}{2}\cdot50=(13+49\cdot4)\cdot 50=10,450](https://tex.z-dn.net/?f=S_n%3D%5Cdfrac%7Ba_1%2Ba_n%7D%7B2%7D%5Ccdot%20n%3D%5Cdfrac%7Ba_1%2Ba_1%2B%28n-1%29r%7D%7B2%7D%5Ccdot%20n%3D%5Cdfrac%7B2a_1%2B%28n-1%29r%7D%7B2%7D%5Ccdot%20n%5C%5C%5C%5C%5C%5CS_%7B50%7D%3D%5Cdfrac%7B2%5Ccdot13%2B%2850-1%29%5Ccdot8%7D%7B2%7D%5Ccdot50%3D%2813%2B49%5Ccdot4%29%5Ccdot%2050%3D10%2C450)
I can try how do I help you ?