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lesya692 [45]
3 years ago
13

Given the following equation x2 + 4x = 21 find the solutions. (Show All Work)

Mathematics
1 answer:
NeTakaya3 years ago
7 0

Step-by-step explanation:

15a)

x^2+4x=21               Subtract both sides by 21

x^2+4x-21 =0

15b)

7 and -3 multiply to -21 and add to 4

The factors are (x+7)(x-3)

15c)

x+7 =0

x=-7  

x-3=0

x=3              

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On 1 May 2012, the cost of 5 grams of gold was 14 000 rupees.
navik [9.2K]

Answer:

51,800 rupees

Step-by-step explanation:

Cost of 5 grams of gold on 1 May 2012 = 14 000 rupees.

The cost of gold decreased by 7.5% from 1 May 2012 to 1 May 2013

Cost of 5 grams of gold on 1 May 2013 = 14,000 - 7.5% of 14,000

= 14,000 - 0.075 × 14,000

= 14,000 - 1,050

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Work out the cost of 20 grams of gold on 1 May 2013

Since, there are four 5 grams of gold in 20 grams of gold

Therefore,

Cost of 20 grams of gold on 1 May 2013 = 12,950 rupees × 4

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4 0
3 years ago
How can two different rectangles both have a perimeter of 24 cm​
dem82 [27]

Explanation:

Perimeter is simply the sum of all the edges. The same way 10 can be made of 4+6 or 3+7, the perimeter can be made by many combinations. if you know the 2 must equal 24cm, then we can create numerous combinations.

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3 years ago
A pet store has 9 puppies and 48 kittens what is the ratio of kittens to puppies
Ierofanga [76]
48:9

So, their's 48 kittens in 9 puppies.

48:9
96:18
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8 0
3 years ago
Read 2 more answers
-Clare mixes 2 1/2 cups of water with 1/3 cup of orange juice concentrate.
Klio2033 [76]

Answer:

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(water:juice)

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