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miss Akunina [59]
2 years ago
12

QUADRATIC EQUATION â€" WORD PROBLEMS

Mathematics
1 answer:
dusya [7]2 years ago
4 0

Answer: -7, 12

Step-by-step explanation:

a+b = 5

a*b = -84

a = 5-b

(5-b)*b = -84

-b^2 + 5b + 84 = 0

(-b - 7)(b + 12) = 0

The roots are -7 and 12.

I'm not sure what â€" stands for

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Student grades on a chemistry exam were: 77, 78, 76, 81, 86, 51, 79, 82, 84, 99
IrinaK [193]

Answer:

Step-by-step explanation:

A) Stem-and-leaf plot

stem          leaf

5                 1

7                 6,7,8,9

8                 1,2,4,6

9                  9

B) Outlier

Could consider 51 an outlier.

3 0
2 years ago
What is 12 1/4`÷7/8
Sidana [21]

Answer:

14

Divide

12 and 1 over 412

1

4

÷ 7 over 8

7

8

= 392 over 28

392

28

Step 1 of 2: Divide, sub-step a: Convert mixed number to improper fraction.

Convert mixed number to improper fraction

12 and 1 over 412

1

4

= ( 12 × 4 ) over 4

12 × 4

4

+ 1 over 4

1

4

= ( 48 + 1 ) over 4

48 + 1

4

= 49 over 4

49

4

Step 1 of 2: Divide, sub-step b: Divide.

Divide

49 over 4

49

4

÷ 7 over 8

7

8

= 49 over 4

49

4

× 8 over 7

8

7

= ( 49 × 8 ) over ( 4 × 7 )

49 × 8

4 × 7

= 392 over 28

392

28

To divide fractions, invert the second one (turn it upside-down), then multiply the numerators and denominators.Divide

12 and 1 over 412

1

4

÷ 7 over 8

7

8

= 392 over 28

392

28

Step 1 of 2: Divide, sub-step a: Convert mixed number to improper fraction.

Convert mixed number to improper fraction

12 and 1 over 412

1

4

= ( 12 × 4 ) over 4

12 × 4

4

+ 1 over 4

1

4

= ( 48 + 1 ) over 4

48 + 1

4

= 49 over 4

49

4

Step 1 of 2: Divide, sub-step b: Divide.

Divide

49 over 4

49

4

÷ 7 over 8

7

8

= 49 over 4

49

4

× 8 over 7

8

7

= ( 49 × 8 ) over ( 4 × 7 )

49 × 8

4 × 7

= 392 over 28

392

28

To divide fractions, invert the second one (turn it upside-down), then multiply the numerators and denominators.

4 0
3 years ago
Look at image. reflection across the x-axis​
REY [17]

Answer:

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Step-by-step explanation:

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2 years ago
Calculate sum5.3 +(-7.45) =
dsp73

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Step-by-step explanation: you just need a college calculator to solve ,you need to just plug the numbers and it will do it for you.

6 0
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grigory [225]

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