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3 years ago

9

Select one card from two cards, one colored red, one colored blue. replace the card and repeat the experiment. what is the proba

bility of selecting a blue card each time?

1 answer:

elena55 [62]3 years ago

4 0

The probability of picking the blue card is 1/2 each time.

The probability of picking it BOTH times is

(1/2)•(1/2) = 1/4. (25%)

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I am a rectangle, and my area is 80 square inches. My width is 2 inches shorter than my length. What is my perimeter?

pshichka [43]

Area=l*b=l*(l-2)=80(given)

so, l^2 - 2l =80
l^2 - 2l - 80=0
l=10 or -8

l=10,b=10-2=8
perimeter=2(l+b)=2(18)=36

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3 years ago

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Plss help I’ll give brainlist or what ever it’s called

Pachacha [2.7K]

1/4 i think hope that helps

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What is the value of the expression 2x² – 5x + 6 when<br> x = -2?

Svet_ta [14]

Answer:

24 is correct answer

Step-by-step explanation:

$2 {x}^{2} - 5x + 6 \\ = 2 {( - 2)}^{2} - 5 \times ( - 2) + 6 \\ = 2 \times 4 + 10 + 6 \\ = 8 + 10 + 6 \\ = 24$

hope it helped you:)

3 0

3 years ago

8) The height of a building h varies directly as the length and inversely as the width, if h = 25m when l = 10m and w = 5m, find

shtirl [24]

Let h,l, and w represent the height, length, and width of the building respectively

Then

$\begin{gathered} h\text{ = }\frac{kl}{w} \\ \text{where k is the constant of proportionality} \end{gathered}$ $\begin{gathered} \Rightarrow k=\frac{hw}{l} \\ \Rightarrow k=\frac{25\times5}{10}=12.5 \end{gathered}$ $\Rightarrow h=\frac{12.5l}{w}$

The new value of h = 50m, but l remains the same.

That is l = 10m

Therefore

$\begin{gathered} \frac{50}{1}=\frac{12.5\times10}{w} \\ \Rightarrow\frac{50}{1}=\frac{125}{w} \\ \text{Cross multiplying, we have} \\ 50w\text{ = 125} \\ \Rightarrow\text{ w=}\frac{125}{50}=2.5 \end{gathered}$

Hence, the width is 2.5m

8 0

1 year ago

Help me please and thank u

marin [14]

$\large \mathfrak{Solution : }$

As we know :

Dividend = Divisor × Quotient ( taking remainder as 0 )

So, Quotient = Dividend ÷ Divisor

by using the above relation we can say :

q = t ÷ 23

therefore, correct option is C. t ÷ 23

6 0

3 years ago