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3 years ago

Two lines are perpendicular if

Mathematics

2 answers:

svetlana [45]3 years ago

3 0

Answer:

They meet/cross at a 90 degree angle

inn [45]3 years ago

3 0

Their slopes are negative reciprocals

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Can you guyz help me with this question step by step please ☺️

zlopas [31]

2 1/2 x 3 = 7 1/2 = 7 4/8

10 11/8
- 7 4/8
3 7/8
A is the correct answer

7 0

3 years ago

Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Jus

vichka [17]

Answer:

(25.732,30.868)

Step-by-step explanation:

Given that in a random sample of 42 people, the mean body mass index (BMI) was 28.3 and the standard deviation was 6.09.

Since only sample std deviation is known we can use only t distribution

Std error = $\frac{s}{\sqrt{n} } =\frac{6.09}{\sqrt{42} } \\=0.9397$

$df = 42-1 =41$

t critical for 99% two tailed $= 2.733$

Margin of error $= 2.733*0.9397=2.568$

Confidence interval lower bound = $28.3-2.568=25.732$

Upper bound = $28.3+2.568=30.868$

3 0

3 years ago

There are 195 adults and 320 children at a zoo. The zoo makes a total of $6,515 from the entrance fees, and the cost of an adult

Ostrovityanka [42]

Answer:

a+c=27

195a+320c=6515

Step-by-step explanation:

adult (a): 195

children (c): 320

total $: $6515

child $: 27

a+c=27 --> c=-a+27

195a+320c=6515

sub the first equation into the 2nd equation to get a=17

sub a=17 into c=-a+27 to get c=10

so, an adult ticket is $17 and a child ticket is $10.

6 0

3 years ago

-7 1/3 written as a fraction is _____. - -10/3 - -21/3 - -22/3 Pls help!!!!!

enot [183]

-7x3+1 = -22/3
That’s the answer

8 0

3 years ago

Read 2 more answers

suppose your average, after taking 4 quizzes is 70 out of 100. what must your average be on the next 4 quizzes to increase your

exis [7]

Answer:

Step-by-step explanation:

Average = Total / Number of Data

$70 \times 4 = 280$

You have a total of 280 points after 4 quizzes.

4+4=8 quizzes in total

Total you need for average to be 82

$82 \times 8 = 656$

Number of points you need to hit required:

$656 - 280 = 376$

You need 376 points in total for the next 4 quizzes.

$376 \div 4 = 94$

You need an average of 94 points on the next 4 quizzes.

5 0

3 years ago