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baherus [9]
3 years ago
8

Arithmetic sequences algebra

Mathematics
1 answer:
andreyandreev [35.5K]3 years ago
3 0

As given arithmetic sequence is :-

-17 , -13 , -9

So, here we have to find a12

a ( 1st term ) = -17

d ( common difference) = a2 - a1

d = -13 -(-17)

d = 4

nth place = a12

Now we know that to find any term we apply formula :-

an = a + (n-1)d

So putting Values in above mentioned formula :-

a12 = -17 + ( 12-1) 4

a12 = -17 + (11)4

a12 = -17 + 44

<h3>a12 = 27 </h3>

Hope it helps

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Rob's first four test scores are 80, 85, 100 and 85. What does he have to score on the last test in order to have a test average
faust18 [17]

Answer:

100

Step-by-step explanation:

85 +80+100+85+x(the unknown),/the number of numbers ie 5

350+x/5=90

350+x=90 * 5

350+x=450

x=450-350

x=100

6 0
2 years ago
Caiden and Josh are practicing at a batting cage. Josh has hit nine more than one-half the number of balls that Caiden has. If t
OverLord2011 [107]

Answer:

The Answer is: Josh hit 47 balls.

Step-by-step explanation:

Let j = Josh number of hits and c = Caiden number of hits:

j = c/2 + 9

Total:

j + c = 123.

Substitute:

(c/2 + 9) + c = 123

c/2 + c = 123 - 9

c/2 + c = 114

1/2c + 2/2c = 114

3/2c = 144

c = 144 (2/3) = 76, Number of hits for Caiden

Solve for j:

j = 76/2 + 9

j = 38 + 9 = 47, number of hits for Josh

Proof:

j + c = 123

47 + 76 = 123

123 = 123

Hope this helps! Have an Awesome Day!! :-)

6 0
3 years ago
Calculate the surface area of the aquarium, without the top.<br>24 cm<br>80 cm<br>16 cm​
larisa86 [58]
Well you never sent a picture but the most logical answer is 80 cm
3 0
2 years ago
10. Solve the inequalities and compare.<br> a. Solve 2x+6 &lt; 10.
natali 33 [55]

Answer:

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4 0
3 years ago
AND THEN ONCE U HAVE THE ANSWER <br>FIND THE LENGTH OF AC ​
Vadim26 [7]

Answer:

AC=18

Step-by-step explanation:

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144-64=b²

80=b²

√80=√b²

8.94427191=b

That is for one of the two right triangles that make up the tent.  Since there are 2 triangles, 8.94427191 only equals BC or AB.  So, multiply 8.94427191×2=17.88854382 to find the length of AC.

AC= 18

6 0
3 years ago
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