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pychu [463]
3 years ago
7

Solve the quadratic equation.

Mathematics
1 answer:
andrew-mc [135]3 years ago
8 0
(x - 7)^2 = 81

x - 7 =  \pm \sqrt{81}

x - 7 =  \pm 9

x = 9 + 7 \ \ or \ x = -9 + 7

x = 16 \ \ or \ x = -2

----------------------------------------------------------
Answer: x = 16 or x = -2 ( Answer C)
----------------------------------------------------------
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A standard pair of six-sided dice is rolled. What is the probability of rolling a sum less than 7? Express your answer as a frac
zzz [600]

Answer:

0.4167 is the probability of rolling a sum less than 7.  

Step-by-step explanation:

We are given the following in the question:

Event: A standard pair of six-sided dice is rolled

A: rolling a sum less than 7

Sample space:

{(1,1),(1,2),(1,3),(1,4),(1,5),(1,6)

(2,1),(2,2),(2,3),(2,4),(2,5),(2,6)

(3,1),(3,2),(3,3),(3,4),(3,5),(3,6)

(4,1),(4,2),(4,3),(4,4),(4,5),(4,6)

(5,1),(5,2),(5,3),(5,4),(5,5),(5,6)

(6,1),(6,2),(6,3),(6,4),(6,5),(6,6)}

A:

{(1,1),(1,2),(1,3),(1,4),(1,5),(2,1),(2,2),(2,3),(2,4),(3,1),(3,2),(3,3),(4,1),(4,2),(5,1)}

Formula:

\text{Probability} = \displaystyle\frac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}

P(A) = \dfrac{15}{36} = 0.4167

0.4167 is the probability of rolling a sum less than 7.

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How do I find the triangles similarity and each length
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Bill plans to buy school supplies and the following equation represents what he bought.
iren2701 [21]

Answer:

1. x = 8

2. y = 1/2

Step-by-step explanation:

1. Plug the function

5x + 20(0.50) = 50

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2. Plug in the function

5(8) + 20y = 50

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Subtract 40 on both sides

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Divide 20 both sides

= y = 10/20 | 1/2

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