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4 years ago

Can someone please help me I got this question wrong

Mathematics

2 answers:

lana66690 [7]4 years ago

6 0

Answer: Answer is C, Associative and Distributive

Step-by-step explanation:

On step one to step two it shows that llz is added to 6z (Both have Z) and from step 2 to 3, 5 is distributed (Multiplied) by 17z which equals 85z and also Distributed (Multiplied) by 29 which gives you 145. Which makes final equation... 85z + 145

denpristay [2]4 years ago

3 0

Answer:

I think commutative then distributive.

Step-by-step explanation:

First 17 and 6 is added makes 19 an equivalent. Than 5 is distributed.

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If x - 3y = -9 and 5x - 2y = 7, what is the value of x?

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Read 2 more answers

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

<em>Find the area of the garden</em>

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

√(6+x-x²)=9<br> I have to put this just to submit it.

Sergio [31]

We know that it must equal 9, and that we do x•x-x+6 and find the square root

4 0

3 years ago

These two triangles are congruent by the Hypotenuse-Leg Theorem.

Softa [21]

Answer:

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Step-by-step explanation:

Given that the 2 triangles are congruent based on the Hypotenuse-leg theorem, this implies that:

$x - y = x + 2$ , and $2x - y = 4x + 2y$

Using the expression, $x - y = x + 2$ , solve for y:

$x - y - x = x + 2 - x$

$- y = 2$

$y = - 2$

3 0

3 years ago