MATHEMATICS HIGH SCHOOL

The original price of a kind of phone is $1050. Then, it’s price decreases by $50 per month. Calculate the price of the phone after 12 months

Answers

Answer 1
Answer:

Answer:

$450

Step-by-step explanation:

1050 - (12 x 50) = 450

12 x 50 = 600

1050 - 600 = 450
Answer 2
Answer:

Answer:

The phone would cost $450 after 12 months

Step-by-step explanation:

Multiply $50 by 12 months which would equal $600.

Then you would subtract $600 from $1050 which would equal the total price of $450.

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Solve and graph the inequalities
100x-200>50x-75

Answers

100x - 200 > 50x - 75

100x - 50x > -75 + 200

50x > 125

x > 2,5

Good Luck

Jerry had an average score of 85 on his first 8 quizzes. He had an average score of 81 on his first nine quizzes. What score did he earn on his ninth quiz? side note: I got 49 the first time i tried it but when i checked it, it was wronfg

Answers

Well, let's calculate how many points in total he got so far!

He did 8 quizzes, on average 85 points: 85*8=680 points.

He scored a number of points in his ninth quiz, let's call this number "x".

If we want to calculate the average after the ninth quiz, we take the sum of points then (which is 680+x) and we divide it by 9:

(680+x)/9

we also know that this is equal to 81:

(680+x)/9=81

((680+x))/(9)=81

multiply both sides by 9:

(680+x)}=729

substracting 680 from both sides:

x=49

well, i got 49 too.

I really can't see where the mistake could be?

where did you check it? my best guess is that the place where you checked it had a typo...?

What is the rate of change?
What is the Y- intercept?

Answers

Answer:

The y-intercept is -5 and I’m not sure about the rate of change

Step-by-step explanation:

Find the sum of 12/13 +(-1/3)

Answers

Answer:

23/39

Step-by-step explanation:

Step 1:

12/13 + ( - 1/3 )

Step 2:

36/39 - 13/39

Answer:

23/39

Hope This Helps :)

PLEASE HELP, I HAVE TO PASS!!!!!!Position Value of Term
1 7
2 10
3 13
4 16
5 19
6 22

Which expression gives the number in the nth position in the sequence?
A) 2n - 2
B) 3n + 4
C) 4n - 1
D) 5n

Answers

Answer:

Option B is correct

3n+4[/tex]

Step-by-step explanation:

The nth term for the arithmetic sequence is given by:

a_n = a_1 +(n-1)d              ....[1]

where,

a_n is the nth position

n is the number of term

a_1 is the first term and

d is the common difference.

Given the table:

Position(n)  Value of Term(a_n)

1                     7

2                     10

3                     13

4                     16

5                     19

6                     22

from the given table:

At n = 1 ,

a_1 = 7

At n = 2

a_2 = 10

at n = 3

a_3 = 13 and so on

Common difference(d) for the sequence is  3

Since,

d = a_2-a_1=a_3-a_2.....

⇒d = 10-7=13-10......... = 3

Substitute d = 3 and a_1 = 7 in [1] we have;

a_n = 7+(n-1)(3)

⇒a_n = 7+3n-3

⇒a_n =3n+4

Therefore, the expression gives the number in the nth position in the sequence is, 3n+4
3n+4
3(3)+4
9+4
13
 is the B). 

The corresponding edges of two regular tetrahedrons are 1 cm and 3 cm. If the sum of the weights of the two tetrahedrons is 100 grams and both solids are made up of the same material, find the weight of the bigger solid.

Answers

m 1 = V 1 * d
m 2 = V 2 * d
Both tetrahedrons have the same density.
V = 1/3 * a²√3/4 * h
V 1 = 1/3 * 1² * √3 / 4 * √2 / √3 = √2 / 12 cm³ 
V 2 = 1/3 * 3²√3 /4 * √6 = 9√2 / 4 cm³
m 1 : m 2 = √2 /12 : 9√2/4
m 1 * 9√2 / 4 = m 2 * √2 / 12
m 1 = m 2 / 27
m 1 + m 2 = 100 g
m 2 / 27 + m 2 = 100 g   / * 27
m 2 + 27 m 2 = 2700
28 m 2 = 2700
m 2 = 2700 : 28
m 2 = 96.42 g
Answer:
The weight of the bigger tetrahedron is 96.42 g. 
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