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Oksi-84 [34.3K]
3 years ago
11

A jewelry store marked up the price of its well-known necklace. The new price of the necklace is $250, which is 125% of the orig

inal price. What was the original price of the necklace?
A. $125
B. $150
C. $175
D. $200
Mathematics
2 answers:
liraira [26]3 years ago
8 0
The answer would be D
Likurg_2 [28]3 years ago
3 0
D would be your answer.
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How do i solve quadratics and quadratic formula
Murljashka [212]

<u>Step-by-step explanation:</u>

Multiply the first and last coefficient

Find a pair that has the product of ac (above) and the sum of b

Replace the b-term with the pair.

Divide the four terms into two-terms on the left side and two terms on the right side and factor out the common terms from each side.

This is reverse of the distributive property so the terms factored out (on the outside of the common term) combine to create a factor and the common term is the other factor.  

Set each factor equal to zero and solve for the variable.

***************************************************************************************

1a. Answer: a = 1/2      a = -1

2a² + 3a + 1 = 0      → ac=2, b = 3    → use 1, 2  (product is 2 & sum is 3)

2a² + 2a + 1a + 1 = 0

2a² + 2a     +1a + 1        = 0

2a(<u>a + 1</u>)      +1(<u>a + 1</u>)      = 0

(2a + 1)(a + 1) = 0

2a + 1 = 0       and         a + 1 = 0

       a = 1/2    and               a = -1

**************************************************************************************

1b. Answer: y = -5/2    y = -5

2y² + 5y - 25 = 0  → ac=-50, b = 5 → use 10, -5  (product is -50 & sum is -5)

2y² + 10y - 5y - 25 = 0

2y² + 10y      - 5y - 25        = 0

2y(<u>y + 5</u>)      -5(<u>y + 5</u>)      = 0

(2y - 5)(y + 5) = 0

2y + 5 = 0       and         y + 5 = 0

       y = -5/2    and               y = -5

**************************************************************************************

1c. Answer: y = 5     y = 1/2

2y² - 11y + 5 = 0  → ac=10, b = -11 → use -1, -10  (product is 10 & sum is -11)

2y² - 1y - 10y + 5 = 0

2y² - 1y       -10y + 5        = 0

y(<u>2y - 1</u>)      -5(<u>2y - 1</u>)      = 0

(y - 5)(2y - 1) = 0

y - 5 = 0       and         2y - 1 = 0

     y = 5       and               y = 1/2

4 0
3 years ago
Two rectangular prisms have the same volume. The area of the base of the blue prism is 216 square units. The area of the base of
ikadub [295]

Answer:263 square units

Step-by-step explanation:

No work needed

6 0
3 years ago
A go-kart top speedtop speed is 607,200 ft per hour. what is the speed in miles per hour.
Maru [420]
Divide 607,200 by 5280 which equals 115
6 0
3 years ago
Nikhil gets paid a 5 percent commission on every pair of shoes that he sells. He earned $1.00 on the last pair of shoes that he
Jlenok [28]
If $1 is 5%, 100% would be $1 times 100/5= $1 times 20 = $20
7 0
3 years ago
Read 2 more answers
2 points
sattari [20]

Answer:

well the answer is 7 rides

Step-by-step explanation:

25 - 4

=21

21÷3

=7

(p.s working might not be in the right format but its right)

6 0
3 years ago
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