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charle [14.2K]
3 years ago
6

Find the value of x. Round to the nearest tenth. 26 12 X X = Enter

Mathematics
2 answers:
brilliants [131]3 years ago
5 0

Answer:

322. So this is correct or wrong

Sladkaya [172]3 years ago
3 0
Tangent26=opposite/ adjacent
Tan26=x/12
x=tan26*12
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Find Sn for the arithmetic series 5+7+9 + … and determine the value of n for which the series has sum 165.
SVETLANKA909090 [29]

Answer:

see explanation

Step-by-step explanation:

the sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2}[2a + (n - 1)d ]

where d is the common difference and a is the first term

here d = 9 - 7 = 7 - 5 = 2 and a = 5, hence

S_{n} = \frac{n}{2}[(2 × 5) + 2(n - 1) ]

                        = \frac{n}{2}(10 + 2n - 2)

                        = \frac{n}{2}(2n + 8)

                        = n² + 4n

When sum = 165, then

n² + 4n = 165 ← rearrange into standard form

n² + 4n - 165 = 0 ← in standard form

(n + 15)(n - 11) = 0 ← in factored form

equate each factor to zero and solve for n

n + 15 = 0 ⇒ n = - 15

n - 11 = 0 ⇒ n = 11

but n > 0 ⇒ n = 11



4 0
3 years ago
At a grocery store you can buy a whole chicken the weights 4 pounds for $3.88 you can also buy a package of chicken drumsticks t
lilavasa [31]
The better buy is 4lbs for $3.88
3.88/4=.97
3.06/3=1.02

4 0
3 years ago
Help me with this math work please
Aloiza [94]
Your photo is super blurry! I can’t read parts of the problems, so I can’t exactly help you. Sorry! Good luck.
7 0
2 years ago
Read 2 more answers
A bag contains 20 marbles. The probability of picking a yellow marble is 3/4. How many marbles are yellow?
emmasim [6.3K]
15 because 3/4 is equivalent to 75% and 75% of 20 is 15.
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3 years ago
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True or false:<br> the following equation is in standard form. <br> (x - 4.2)^2 - 3 = 0
natita [175]

Answer:

false

Step-by-step explanation:

standard form cannot contain fractions or decimals

3 0
2 years ago
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