C = 3b+2d is the same as 3b+2d = C
Let's isolate d. To do this, we first need to subtract 3b from both sides
3b+2d = C
3b+2d-3b = C-3b
2d = C-3b
Then divide both sides by 2
2d = C-3b
2d/2 = (C-3b)/2
d = (C-3b)/2
Take note of the parenthesis as they are very important. We want to divide ALL of C-3b over 2. We don't want to just divide -3b over 2.
The answer choices you have aren't 100% clear but I have a feeling your teacher meant to say d = (C-3b)/2 instead of d = C-3b/2 for choice A
If that assumption is correct, then the answer is choice A.
70 times 6, which equals 430,step my step:6 times 0 is 0,6 times 7 is 42,=420,Hope this helps if u need me too explain further let me now.:)
ANSWER
D. 224
EXPLANATION
The given series is
![\sum_{n=1}^{14}(2n+1)](https://tex.z-dn.net/?f=%5Csum_%7Bn%3D1%7D%5E%7B14%7D%282n%2B1%29)
The first term of this series is
![a_1=2(1) + 1 = 3](https://tex.z-dn.net/?f=a_1%3D2%281%29%20%2B%201%20%3D%203)
The last term of this series is:
![l = 2(14) + 1 = 29](https://tex.z-dn.net/?f=l%20%3D%202%2814%29%20%2B%201%20%3D%2029)
The sum of the first n-terms of the series is calculated using the formula,
![S_n= \frac{n}{2} (a + l)](https://tex.z-dn.net/?f=S_n%3D%20%5Cfrac%7Bn%7D%7B2%7D%20%28a%20%2B%20l%29)
![S_ {14}= \frac{14}{2} (3+ 29)](https://tex.z-dn.net/?f=S_%20%7B14%7D%3D%20%5Cfrac%7B14%7D%7B2%7D%20%283%2B%2029%29)
![S_ {14}= 7 \times (32)](https://tex.z-dn.net/?f=S_%20%7B14%7D%3D%207%20%5Ctimes%20%20%2832%29)
![S_ {14}= 224](https://tex.z-dn.net/?f=S_%20%7B14%7D%3D%20224)
Answer:
About $1.75 per tennis balls
Step-by-step explanation:
A tin of 4 tennis balls costs $6.99. We are asked to find the price of one tennis ball.
We need to find the unit price, or price per ball.
Divide the cost by the number of tennis balls.
cost / tennis balls
cost = $6.99
tennis balls = 4 tennis balls
$6.99 / 4 tennis balls
Divide 6.99 by 4.
$1.7475 / 1 tennis ball
Round to the nearest cent or hundredth. The 7 in the thousandth place tells us to round the 4 to a 5 in the hundredth place.
$1.75 / 1 tennis ball
It would cost approximately $1.75 for one tennis ball.