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andreyandreev [35.5K]
3 years ago
14

Factor the quadratic by checking factor pairs. -15x2 – 21x + 18 -15x2 – 218 + 19 = -3

Mathematics
1 answer:
d1i1m1o1n [39]3 years ago
3 0

Answer:

-3(x + 2)(5x - 3)

Step-by-step explanation:

-15x² – 21x + 18

-3(5x² + 7x - 6)

-3[5x² + 10x - 3x - 6]

-3[5x(x + 2) - 3(x + 2)]

-3(x + 2)(5x - 3)

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Need help figuring this equation 1/12c =.6
soldi70 [24.7K]
1/12c = 0.6

To remove a fraction you simply multiply it by its inverse fraction (take the original fraction and flip it! So, multiply it by 12/1 (which is the same as saying 12).

12(1/12c) = 0.6*12

The 12 cancels out leaving this: 

c  = 0.6 * 12
c = 7.2

If you don't have or are allowed to use a calculator. To compute that you simply make 0.6 into a fraction then multiply the numerator by 12. .6 is in the tenths place so you can write it like this: 
6/10 simplifying it becomes, 3/5

3/5 * 12 = 36/5

Now! That was assuming 1/12c was written like this: 
(1/12)c = 0.6

If it was actually written like this: 
1/(12c) = 0.6 then you'll do this. 

Multiply 0.6 by 12c. Which will get you 7.2c. After that you need to get c alone, so you divide both sides by 7.2. Yielding the result: 

1/7.2 = c 

c = 0.1389...


5 0
3 years ago
Use the quadratic formula to solve for x 3x^2+14x=-11
Lady bird [3.3K]
Answer is C. X=-11/3 x=-1. Hope this helps!
8 0
2 years ago
Your mother gave you $13.32 to buy a present. This covered 1/5 of the cost. How much did the present cost?
Nady [450]

Answer:

$66.60

Step-by-step explanation:

Step 1 so she gave you 13.32 and covers 1 fifth of the cost so you have to times 13.32 by 5 to get how much does the present cost so the total after I times 13.32 by5 equals $66.60

6 0
3 years ago
2/3 + w = 3/2 what is w
german

Answer:

0.8333

Step-by-step explanation:

2/3 + x

x + 2/3

x + 2/3 = 3/2

x + 2/3 - 3/2 = 0

2/3 - 3/2 = 4/6 - 9/6 = - 5/6

x - 5/6 = 0

use linear function

f(x) - ax + b

f(x) = x - 5/6

a = 1

b = - 5/6

x- 5/6= 0

x = 5/6

x = 0.8333

6 0
3 years ago
What is the metric equivalent in meters to 1250 feet?
Dvinal [7]

381 meters because you divide 1250 by 3.281 and you get 381 meters

6 0
3 years ago
Read 2 more answers
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