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patriot [66]
1 year ago
12

Write an explicit formula for the following sequence. Find the twentieth term. 11, 12, 13, 14, 15, …

Mathematics
1 answer:
aleksandr82 [10.1K]1 year ago
8 0

The arithmetic sequence is given by:

a_n=a_1+(n-1)d

Where:

a1 = First term

d = Common difference

Using the data provided:

\begin{gathered} a_1=11 \\ a_2=12=11+(2-1)d_{} \\ 12=11+d \\ d=12-11 \\ d=1 \end{gathered}

Therefore, the explicit formula is:

\begin{gathered} a_n=11+(n-1)1 \\ a_n=11+n-1 \\ a_n=n+10 \end{gathered}

n = 20

\begin{gathered} a_{20}=20+10 \\ a_{20}=30 \end{gathered}

Answer:

\begin{gathered} a_n=n+10 \\ a_{20}=30_{} \end{gathered}

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An architect designs a rectangular flower garden such that the width is exactly two-thirds of the length. If 340 feet of antique
KIM [24]

Answer:

The dimensions of the garden is 102 feet by 68 feet

Step-by-step explanation:

Here, we want to get the width and length of the garden

The perimeter is represented by the length of the fencing

From the question;

w = 2l/3

The formula for the perimeter is;

P = 2(l + w)

Thus;

340 = 2(l + 2l/3)

170 = (l + 2l/3)

Multiply through by 3

510 = 3l + 2l

5l = 510

l = 102 feet

w = 2/3 * l

w = 2/3 * 102

w = 68 feet

7 0
3 years ago
Gravity is a force that acts upon a ball after it is thrown?
Elena-2011 [213]

True or false, depending on the specifics. True, because the gravity makes it go to the ground. False, because gravity is always working, so you don't need to throw the ball. However since it doesn't say that it only happens when you throw it. The answer should be true.

6 0
2 years ago
A company invests a total of ​$40 comma 000 of surplus funds at two annual rates of​ interest: 5​% and 6one half ​%. It wishes a
vampirchik [111]
Suppose the company invests x of their surplus in the 5% rate (and thus 40000-x has 6.5%). Then we have that 5%*x+(40000-x)6.5%=6.25%*40000.
We have that solving this, 5%* x+40000*6.5%-6.5%*x =6.25%* 40000 Accumulating terms, 1.5%*x=0.25%*40000 x=40000/6= 6666.67$. We see that if we invest 6666.67$ at 5%, we get exactly the given rate. If we invest more, we obviously get less. Hence, we have that the company has to invest at 6.5% more than 40000-6666.67=33333.33$
8 0
3 years ago
With the cost of sugar at $3.29 per pound, how much ul 7.9 pounds cost, rounded to
riadik2000 [5.3K]
Cost of Sugar per pound = 3.29$
Cost of sugar for 7.9 pounds =
=>3.29 x 7.9
=>25.991$
Rounded to nearest 100ths place = 26.000$
7 0
3 years ago
Read 2 more answers
The coordinate points of T are (0,6). The midpoint of ST is (6,-8). Find the coordinate of point S.
givi [52]

Answer:

The coordinates of the point S =  (12, -22)

Step-by-step explanation:

The coordinate points of T = (0,6)

Mid point of ST = (6,-8)

Let the coordinates of S = (a,b)

Now, BY MID POINT FORMULA:

If (x, y) and (z, w) are the line point joining line segment and (p,q) is the coordinate of mid point. Then

(p, q)  = (\frac{x  + z}{2}  , \frac{y + w}{2} )

So, here similarly, (6, -8)  = (\frac{(0+a)}{2}  , \frac{6+ b}{2} )

⇒ 6   = \frac{0+a}{2}  , -8 =  \frac{6+ b}{2}

⇒ a =2 x 6 = 12, b = 2 (-8) -6 = -22

⇒(a,b) = (12, -22)

Hence, the coordinates of the point S =  (12, -22)

6 0
3 years ago
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