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77julia77 [94]
2 years ago
14

Which of the following situations can be represented by the expression 3n – 15 ? Select all that apply. ​

Mathematics
1 answer:
densk [106]2 years ago
6 0

Answer: B

Step-by-step explanation:

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Three fourths a number plus 8 is 20 less than the number
VARVARA [1.3K]

Answer:

Equation:  \frac{3}{4}n+8=n-20

Solve for n:  n = 112

Step-by-step explanation:

To first set up the equation, you need to look at the verbal description and translate into numbers and operations:

'three fourths a number' =  \frac{3}{4} n

'plus 8' = + 8

'is' =

'20 less' = - 20

'the number' = n

Put the expressions together:

'three fourths a number plus 8':  \frac{3}{4}n+8

'20 less than the number': n - 20

Set them equal to each other and solve: \frac{3}{4}n+8=n-20

Add 20 to both sides: \frac{3}{4}n+8+20=n-20+20

Subtract \frac{3}{4}n from both sides: \frac{3}{4}n-\frac{3}{4}n+28=n-\frac{3}{4}n

Multiply both sides by \frac{4}{1}: \frac{4}{1}28=\frac{1}{4}n\frac{4}{1}

Solve for n:  n = 112

7 0
3 years ago
Which of the following p-values will lead us to reject the null hypothesis if thelevel of significance equals 0.05?a.0.15b.0.10c
Ipatiy [6.2K]

Answer: 0.025

Step-by-step explanation: we reject null hypothesis if p<0.05

8 0
3 years ago
Which shows how to determine the volume of the pyramid? A square pyramid with a base of 3 meters by 3 meters and a height of 5 m
deff fn [24]

Answer:

The first one

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
On the picture to the right,
Anettt [7]

Answer:

AB =  5.2

AC =  5.2

m∠3 =  30 degrees

, m∠4 =  30 degrees

Step-by-step explanation:

Triangle ABO and ACO are both 30 60 90 triangles and are equal

Therefore If we have two sides then we can figure out the last side

Click to let others know, how helpful is it

5 0
3 years ago
What are the solutions of the system of equations y = –(x + 2)2 + 1 and y = 2x + 5?
Scilla [17]

Answer:

(–4, 5) and (–2, 1)

Step-by-step explanation:

8 0
2 years ago
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