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3 years ago

I need help please!

Mathematics

2 answers:

lesantik [10]3 years ago

6 0

Answer:

the correct answer is true

Elis [28]3 years ago

4 0

True the first box is the right answer

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Evaluate P(5, 2) 20 60 240 10

vesna_86 [32]

P(5,2) = n! /(n-r)!

n = 5, r = 2:

= (5 x 4 x 3 x 2 x 1 ) / 3 x 2 x 1

Cancel out common factors:

= 5 x 4 = 20

The answer is 20.

3 0

4 years ago

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Write a count on 1 fact to show a sum of 8.Then write a doubles fact to show a sum of 8

lana66690 [7]

One fact you can use is 4+4 or 5+3.

8 0

3 years ago

A motorbike travels 45 miles in 15 minutes, what is its speed ???? help ASAP please

sukhopar [10]

If the motorbike is doing 45 miles in 15 minutes, it's doing 90 miles in 30 minutes, and 180 miles in 60 minutes. That's 180 mph.

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4 years ago

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A square building with an area of 225 m2 has a garden surrounding it that has an equal width on all sides. The area of the garde

xenn [34]

Answer:

The width of the garden is 1.16 m

Step-by-step explanation:

step 1

Find the area of the garden

To find out the area of the garden multiply by 1/3 the area of the building

$225(\frac{1}{3})=75\ m^2$

step 2

Find the length side of the square building

The area of a square is

$A=b^2$

where

b is the length side of the square

we have

$A=225\ m^2$

$b^2=225\\b=15\ m$

step 3

Find the width of the garden

Let

x ----> the width of the garden

we know that

The area of the building plus the area of the garden is equal to

$(15+2x)^2=225+75$

solve for x

$225+60x+4x^2=225+75\\4x^2+60x-75=0$

Solve the quadratic equation by graphing

using a graphing tool

The solution is x=1.16 m

see the attached figure

therefore

The width of the garden is 1.16 m

Find the exact value

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$4x^2+60x-75=0$

$a=4\\b=60\\c=-75$

substitute in the formula

$x=\frac{-60\pm\sqrt{60^{2}-4(4)(-75)}} {2(4)}$

$x=\frac{-60\pm\sqrt{4,800}} {8}$

$x=\frac{-60\pm40\sqrt{3}} {8}$

$x=\frac{-60+40\sqrt{3}} {8}\ m$ ----> exact value

8 0

3 years ago

If f is continuous and (integral of f(x)dx from 0 to 4 is = 10), find the integral of (f(2x))dx from 0 to 2.

skelet666 [1.2K]

The problem ask to calculate the integral of (f(2x)) dx from 0 to 2 a. Base on my calculation and further computation, I came with a solution that leads to an answer of (f(2x))dx = 5. I hope you are satisfied with my answer and feel free to ask for more if you have clarification and further question.

7 0

3 years ago

I need help please! ​

I need help please!