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Tresset [83]
3 years ago
9

Bradley answered 80% of the questions on his science test correctly. There were 30 questions on the test, and all the questions

had equal value. How many questions did Bradley answer correctly on his test?
Mathematics
2 answers:
son4ous [18]3 years ago
8 0

Answer:

24 correct questions

Step-by-step explanation:

weqwewe [10]3 years ago
6 0
Multiply 30 by 80% - or 0.8.
The resulting number is how many questions he got right.
Subtract that number from the total of 30, and you'll know how many he got wrong.
You can also do it as a fraction - 80% out of 100% is 80/100, or 4/5. So he got 4/5 right and 1/5 wrong.
30 multiplied by 1/5 is the same as 30 divided by 5. So 30 divided by 5 will be how many questions he got wrong.
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Complete the equation of the line through ( 4 , -8 ) and ( 8 , 5 )
irinina [24]

Answer:

Therefore the equation of the line through ( 4 , -8 ) and ( 8 , 5 ) is

13x - 4y = 84.

Step-by-step explanation:

Given:

Let,

point A( x₁ , y₁) ≡ ( 4 ,-8)

point B( x₂ , y₂) ≡ (8 , 5)

To Find:

Equation of Line AB =?

Solution:

Equation of a line passing through Two points A( x₁ , y₁) and B( x₂ , y₂)is given by the formula

(y - y_{1} )=(\frac{y_{2}-y_{1} }{x_{2}-x_{1} })\times(x-x_{1}) \\

Substituting the given values in a above equation we get

(y-(-8))=(\frac{5-(8)}{8-4})\times (x-4)\\ \\(y+8)=\frac{13}{4}(x-4)\\\\4(y+8)=13(x-4)\\4y+32=13x-52\\13x-4y=84...............\textrm{which is the required equation of the line AB}

Therefore the equation of the line through ( 4 , -8 ) and ( 8 , 5 ) is

13x - 4y = 84.

4 0
3 years ago
What is the prime factorization of 891
Advocard [28]

891

prime factors   number to factorize

3                          297

3                          99

3                          33

3                          11

11                          1

Therefore, the prime factorization of 891 is 1×3×3×3×3×11= 1×3^4×11, or 1*81*11




6 0
3 years ago
Read 2 more answers
The number of potato chips in a bag is normally distributed with a mean of 74 and and a standard deviation of 4. Approximately w
aleksklad [387]

Answer:

99.8%  is the percent of bags contain between 62 and 86 potato chips.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 74

Standard Deviation, σ = 4

We are given that the distribution of number of potato chips in a bag is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

P( bags contain between 62 and 86 potato chips)

P(62 \leq x \leq 86) = P(\displaystyle\frac{62 - 74}{4} \leq z \leq \displaystyle\frac{86-74}{4}) = P(-3 \leq z \leq 3)\\\\= P(z \leq 3) - P(z < -3)\\= 0.999 - 0.001 = 0.998 = 99.8\%

P(62 \leq x \leq 86) = 99.8\%

7 0
3 years ago
Read 2 more answers
Geometry please answer
nika2105 [10]

Answer: 8

Step-by-step explanation:

\frac{180(n-2)}{n}=135\\180(n-2)=135n\\180n-360=135n\\-360=-45n\\n=\boxed{8}

3 0
2 years ago
What is the value of x?
kotegsom [21]

Answer:

X=15

Step-by-step explanation:

A +B + C = 180

2x +4x+ 6x = 180

12x =180

X= 15

4 0
3 years ago
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