Please don't use just for the points I actually need help with this

Mathematics

2 answers:

Tems11 [23]2 years ago

8 0

Answer:

Cost before sales tax= 16 dollars

Total cost= 17.16 dollars

Step-by-step explanation:

We know the sales tax rate is 7.25 percent.

To find the cost from the tax rate, we divide the cost of the sales tax by the rate.

1.16/0.0725 = 16 dollars

Now to find the total cost, add the cost before the tax rate by the sales tax amount.

16+1.16= 17.16 dollars

JulijaS [17]2 years ago

6 0

Answer:

Cost before sales tax is 16$

Total cost is 17.16 $

Step-by-step explanation:

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Select the two values of x that are roots of this equation.<br> x^2+1=5x <br> *APEX

snow_lady [41]

Answer:

$\large\boxed{B.\ x=\dfrac{5+\sqrt{21}}{2},\ C.\ x=\dfrac{5-\sqrt{21}}{2}}$

Step-by-step explanation:

$\text{Use the quadratic formula:}\\\\ax^2+bx+c=0\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\================================\\\\\text{We have}:\\\\x^2+1=5x\qquad\text{subtract}\ 5x\ \text{from both sides}\\\\x^2-5x+1=0\\\\a=1,\ b=-5,\ c=1\\\\b^2-4ac=(-5)^2-4(1)(1)=25-4=21\\\\x=\dfrac{-(-5)\pm\sqrt{21}}{2(1)}=\dfrac{5\pm\sqrt{21}}{2}$