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3 years ago

PLEASE HELP WILL MARK BRAINLIEST

Mathematics

2 answers:

GenaCL600 [577]3 years ago

8 0

Answer:

dude nvm I was wrong

Step-by-step explanation:

I edited this from what I had before

Pavel [41]3 years ago

6 0

Answer:

Apply the sine theorem in triangle ABC:

sin C = AB/AC = 4/5

=> C = arcsin(4/5) = 53.13 deg

As shown in picture, AB//CD. Using the same side interior angles theorem:

=> angle BCD = angle ABC = 90 deg

=> angle ACD = 90 - angle ACB = 90 - C = 90 - 53.13 = 36.87 deg

Apply the cosine theorem in triangle ACD:

cos C = AC/CD

=> CD = AC/cos C = 5/cos(36.87) = 5/0.8 = 6.25

=> Option C is correct

Hope this helps!

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The number of boys of grade 6 students is 220.This is 40more than number of boys grade seven students. How many grade seven boy

belka [17]

Answer:

Given

no of Grade 6 students = 220

no of Grade 7 students = 40 more than grade 6 students

Step-by-step explanation:

boys Grade 7 students = no of Grade 6 students - 40 more than grade 6 students

boys Grade 7 students = 220 - 40

boys Grade 7 students = 180 grade 7 boy students are enrolled

Therefore, 180 grade 7 boy students are enrolled.

6 0

2 years ago

PLEASE HELP! A basket contains four apples and five peaches. Three times, you randomly select a piece of fruit, return it to the

Lana71 [14]

Answer:

100 / 729

Explanation:

The general formula to calculate the probability of each event is:

Probability = number of positive (desired) outcomes / number of total outcomes

Number of apples = 4

Number of peaches = 5

Number of fruits = 9

Since the three times you return the radomly selected fruit, and then mix it, the three times the probability is not affected by the previous selection; so, these are independent events, and you can calculate the probability of the joint event as the product of the probabilities of each individual event.

First time:

Probability of getting an apple = number of apples / number of fruits = 4 / 9

Second time:

Probability of getting a peach = number of peaches / number of fruits = 5 / 9

Third time:

Probability of getting a peach = number of peaches / number of fruits = 5 /9

Joint probability:

= (4/9) × (5/9) × (5/9) = (4 × 5 × 5) / (9 × 9 × 9) = 100 / 729

5 0

3 years ago

Which statement best describes the expression (5 x 3 − 12) x 8? Subtract the product of 5 and 3 from the product of 12 and 8. Mu

Temka [501]

Answer:

Subtract 12 from the product of 5 and 3, then multiply by 8.

Explanation:

This is the only answer that accurately describes the given expression.

I hope this helps! ☺

5 0

3 years ago

Someone tell me what 8x+ 7 isss

Lesechka [4]

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4 0

3 years ago

If lines AB and CD are parallel, which of the following statements are true?

ludmilkaskok [199]

Answer:

Step-by-step explanation:

Parallel lines are lines of equal distance apart (equidistant), that are on the same plane but they never meet

Perpendicular lines meet thus they are not parallel lines

Also, lines that intersect , meet, thus they are not parallel lines

8 0

3 years ago