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ArbitrLikvidat [17]
3 years ago
13

a jar contains 36 marbles. it has 20 red, 12 black, and 4 green marbles. two marbles are drawn; the first is not returned before

the second one is drawn. what is the probability that both marbles are red?
Mathematics
1 answer:
Sedaia [141]3 years ago
4 0
The probability of drawing red on the first draw is 20/36. Having drawn red on the first draw, the probability of drawing red on the second draw is 19/35. The probability that both marbles are red is therefore;
P(both\ red)=\frac{20\times19}{36\times35}=0.302
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Find the angle that makes them supplementary.
8090 [49]

Answer:

Mathematics NCERT Grade 7, Chapter 5: Lines and Angles is all about different lines, line segments, and angles.

A line segment has two end points.

A ray has only one end point (its vertex).

A line has no end points on either side.  

This chapter throws light on topics such as related angles, pair of lines. The chapter deals with different types of angles and lines. The types of angles discussed in this chapter are as follows:

Pairs of Angles          Condition

Two complementary angles Measures add up to 90°

Two supplementary angles Measures add up to 180°

Two adjacent angles Have a common vertex and a common arm but no common interior

Linear pair Adjacent and supplementary

A linear pair is a pair of adjacent angles whose non-common sides are opposite rays.

All the types are discussed in detail and are supplemented with examples and short questions.  

Under the topic pair of lines, various sub-sections are discussed namely:

Intersecting lines

Transversal  

Angles made by a transversal

When two lines intersect (looking like the letter X) we have two pairs of opposite angles. They are called vertically opposite angles. They are equal in measure.

A transversal is a line that intersects two or more lines at distinct points.

Six angles discussed in this section:

1. Interior angles

2. Exterior angles

3. Pairs of Corresponding angles

4. Pairs of Alternate interior angles

5. Pairs of Alternate exterior angles

6. Pairs of interior angles on the same side of the transversal

Transversal of parallel lines

5 0
3 years ago
PLS HELP ME ASAP WITH 1, 2, 5, 6, 11, and 12 PLS!!
melamori03 [73]
1-

number 2) is correct





2- 3) is true



11) Jacob is not correct. because 6radical 5 is irrational



12) radical 20 is an irrational number but

so a+b is irrational



but
\sqrt{225}  = 15 \\ it \: is \: rational

so b+c is rational



good luck
8 0
3 years ago
I need help with finding interior/exterior angles. solve for “?”
Ivenika [448]

Answer:

3. 160

4. 105

5. 95

6. 30

7. 86

8. 130

All triangles equal 180 so when you add the other 2 degrees in the triangle then subtract that by 180 then you get the third angle. The a straight line also equals 180 degrees so when you get the third angle subtract it by 180 then you get the answer to the "?"

That's how I was taught so, hope I got it all right! : )

8 0
3 years ago
Read 2 more answers
Answerrr pleaseee fastttt
steposvetlana [31]
1: 3, 2: 5, 4:14 ther u go
4 0
3 years ago
Read 2 more answers
Help pls pls plss!!! asap
alekssr [168]

Step-by-step explanation:

angle 1=180-(90+58)

=180-148

=32

angle1=angle2=32

angle3=180-(108+32)

=180-140

=40°

7 0
3 years ago
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