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2 years ago

Willing to give brainlyest if you can aswer these for me ASAP

Mathematics

2 answers:

pav-90 [236]2 years ago

6 0

Answer:

x+5=12. x = 7,

7x=21. x = 3,

b-2/3=5/6. b = 1.5,

3/4x=6x=8. x = 1/3,

45=3(x+1). x = 14,

22.5+1.5x. x = 15,

20+(5•9). $65

Step-by-step explanation:

vichka [17]2 years ago

5 0

Answer:

Step-by-step explanation:

its simple math

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Simplify each expression with fractional coefficents. 5/6× - 1/6×

bija089 [108]

5/6=.83
1/6=-.16
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3 years ago

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kirill115 [55]

Answer:

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Step-by-step explanation:

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3 years ago

Solve (x + 3)2 + (x + 3) – 2 = 0. Let u = Rewrite the equation in terms of u. (u2 + 3) + u – 2 = 0 u2 + u – 2 = 0 (u2 + 9) + u –

Verdich [7]

Answer:

The solutions of the original equation are x=-5 and x=-2

Step-by-step explanation:

we have

$(x+3)^2+(x+3)-2=0$

Let

$u=(x+3)$

Rewrite the equation

$(u)^2+(u)-2=0$

Complete the square

$u^2+u=2$

$u^2+u+1/4=2+1/4$

$u^2+u+1/4=9/4$

rewrite as perfect squares

$(u+1/2)^2=9/4$

square root both sides

$(u+1/2)=\pm\frac{3}{2}$

$u=(-1/2)\pm\frac{3}{2}$

$u=(-1/2)+\frac{3}{2}=1$

$u=(-1/2)-\frac{3}{2}=-2$

the solutions are

u=-2,u=1

Alternative Method

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

$(u)^2+(u)-2=0$

$a=1\\b=1\\c=-2$

substitute in the formula

$u=\frac{-1\pm\sqrt{1^{2}-4(1)(-2)}} {2(1)}$

$u=\frac{-1\pm\sqrt{9}} {2}$

$u=\frac{-1\pm3} {2}$

$u=\frac{-1+3} {2}=1$

$u=\frac{-1-3} {2}=-2$

the solutions are

u=-2,u=1

Find the solutions of the original equation

For u=-2

$-2=(x+3)$ ----> $x=-2-3=-5$

For u=1

$1=(x+3)$ ----> $x=1-3=-2$

therefore

The solutions of the original equation are

x=-5 and x=-2

4 0

3 years ago

Read 2 more answers

What is 15% of $12.75.

USPshnik [31]

$\frac{15}{100}=0.15 \\ \\ 0.15*12.75=1.91$

$1.91

5 0

3 years ago

At Xcape Boardshop the price tag on the shirt says 12.58. Sales tax 7.5 of price. How much will you pay for the shirt

blsea [12.9K]

Answer:

$13.52

Step-by-step explanation:

5 0

3 years ago

Willing to give brainlyest if you can aswer these for me ASAP​

Willing to give brainlyest if you can aswer these for me ASAP