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LuckyWell [14K]
3 years ago
9

The probability that a student guesses the correct answer to a four-choice multiple-choice question is ​P(correct)=0.25. How man

y correct answers should a student expect to guess on a test with 72 four-choice multiple-choice​ questions?
Mathematics
1 answer:
mylen [45]3 years ago
7 0

Answer: 18

Step-by-step explanation:

0.25 or 1/4 can be answered correctly

there's 72 questions

0.25*72=18

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Solve x2 – 8x + 15 &lt; 0.<br><br> Select the critical points for the inequality shown.
quester [9]

Answer:

x=3,5

Explanation:

x2−8x+15=0

Try to express the terms of the equation in square form.

Adding 16 both sides of the equation,

(x2−2⋅x⋅4+42)+15=16

or,(x−4)2+15−16=0

or,(x−4)2−1=0

or,(x−4)2−12=0

This is the a2−b2=(a+b)(a−b)form.

(x−4+1)(x−4−1)=0

or,(x−3)(x−5)=0

Now, equate both the terms to zero since both of them when multiplied, give zero.

Either,

x−3=0

∴x=3

Or,

x−5=0

∴x=5

Ans:x=3,5 Hope this helpsXD...!!

4 0
3 years ago
Read 2 more answers
What is 3/5 + 1/3 I got my Awncer but it says it's wrong ​
Harlamova29_29 [7]

Answer:

E 14/15

Step-by-step explanation:

3/5 = 9/15

1/3 = 5/15

8 0
3 years ago
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Please help ASAP!!!!!
ra1l [238]
These tables have infinitely many values, but the simplest ones would be:
a) x|y
    3|5
    6|10
    9|15

b) x|y
    2|1
    4|2
    6|3

Your graph for c would look like the attached picture

7 0
3 years ago
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Use doubles mines one to solve 8+7.Write the number sentence.
vlada-n [284]

Answer:

15

Step-by-step explanation:

8+8 would be the doubles and that would equal 16.

Then take one away from 16 and that would equal 15

7 0
3 years ago
The scale on a map is 2 cm = 25 miles. Dave measured the distance to the next town at 5 cm. How many miles away is the next town
Maksim231197 [3]

Answer:

62.5

Step-by-step explanation:

2cm = 25mi

1cm = 12.5 (25/2)

5cm is 2 + 2 + 1

2 + 2 + 1 = 25 + 25 + 12.5 = 62.5

6 0
3 years ago
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