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3 years ago

13

Sound travels through the air different materials at different speeds. The graph shows that one second, sound travels 5971 meter

s through a stone. However, it travels only 346 air in one second. Air, 20 seconds.

1 answer:

Stella [2.4K]3 years ago

3 0

Again,im not quite sure that i understand what youre asking,will you please specify so that i may answer

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The sum of 2 numbers is 28. One number is 5 less than twice the other number. What are the numbers?

suter [353]

28 = x + (2x - 5)
28 = 3x - 5
+5 +5
33 = 3x
/3 /3
11 = x

On number is 11, the other is 17.

Check:
11(2)=22-5=17

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2 years ago

How do I solve question 13 and 14?

xxMikexx [17]

Answer:

13. 13 or 17 (not sure about this, sorry)

14. 28

Step-by-step explanation:

13.

$a_{n} = \{a_{0}, a_{1}, a_{2}, a_{3}, a_{4}, ... \} \\$

if counting the sequence from $a_{0}$ then $a_{4}$ is 17, but if

$a_{n} = \{a_{1}, a_{2}, a_{3}, a_{4}, a_{5}, ... \} \\$

counting from $a_{1}$ , then $a_{4}$ is 13.

14.

$a_{10} = 1 + 3(10 - 1) = 1 + 3*9 = 28$

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3 years ago

Which equation shows that the Pythagorean identity is true for 0=270 degrees. select the equation that is in the form sin^2 0+co

Andru [333]

Answer:

c. (-1)²+0²=1

hope it is helpful to you.

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3 years ago

Help me withw one and two

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2 years ago

A bag contains 20 counters. 8 of the counters are yellow. A counter is picked at random. What is the probability that it is yell

kogti [31]

So there are 8 counters out of 20 which are yellow. so that is 8/20 which is simplified to 2/5
so the answer is 2/5

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2 years ago

Read 2 more answers