Ask question

Ask question

All categories

2 years ago

6

In a classroom of 30 students, in which 18 are girls and 12 are boys, what is the probability that two boys are selected without

replacement by the teacher?

1 answer:

Natali5045456 [20]2 years ago

6 0

Answer:

about 4 out of 10

Step-by-step explanation:

You might be interested in

Prove that 1/sin^2A -1/tan^2A= 1

Vika [28.1K]

Answer:

Step-by-step explanation:

$LHS =\dfrac{1}{Sin^{2} \ A }-\dfrac{1}{Tan^{2} \ A }\\\\\\ = \dfrac{1}{sin^{2} \ A}- \dfrac{1}{\dfrac{Sin^{2} \ A}{Cos^{2} \ A}}\\\\\\= \dfrac{1}{sin^{2} \ A } - \dfrac{Cos^{2} \ A}{Sin^{2} \ A}\\\\\\= \dfrac{1-Cos^{2} \ A}{Sin^{2} \ A}\\\\\\= \dfrac{Sin^{2} \ A}{Sin^{2} \ A}\\\\\\= 1 = \ RHS$

Hint: 1 - Cos² A = Sin² A

4 0

2 years ago

8x-9y=19 4x+y=-7 How Do I Do This Type Of Math

astraxan [27]

8x-9y=19
4x+y=-7
Multiply all terms of the 2nd by (9)===> 36x + 9y= 63

add (36x 9y= 63) to the 1st ===> 44x+0y = -44 ===> x=-1
replace x by this value in any of the equation & you'll get y=-3

4 0

2 years ago

The length and breadth of a rectangular shaped plot is 1215 m and 527 m respectively. Find its perimeter.

ss7ja [257]

Answer:

3484m

Step-by-step explanation:

Add 1215(2) and 527(2) together

4 0

2 years ago

Read 2 more answers

Please, help me out!

nasty-shy [4]

A = lw + πr²
A = (125)(56) + (3.14)(28)²
A = 7000 + 3.14(784)
A = 7000 + 2461.76
A = 9461.76 yd²

8 0

2 years ago

Which of the following is the expansion of (2x – y) 2?

maksim [4K]

The answer is
4x - 2y

8 0

2 years ago

Read 2 more answers