How is the solution

Mathematics

2 answers:

navik [9.2K]3 years ago

4 0

Answer:

wdym what solution put the equation down so I can answer it 4 u

shusha [124]3 years ago

4 0

Answer plz type in question

Step-by-step explanation:

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a rhyolite rock has a volume of 9.5 ml. the density of the rock is 2.6 g/cm. what is the mass of the rock

barxatty [35]

3.653846153846154

Density = Mass/Volume
Density = 9.5/2.6 ≈ 3.65 g

3 0

3 years ago

2x^2 -7= 74 please show all work

skad [1K]

$2x^2-7=74\\
2x^2=81\\
x^2=\dfrac{81}{2}\\
x=-\sqrt{\dfrac{81}{2}} \vee x=\sqrt{\dfrac{81}{2}}\\
x=-\dfrac{9}{\sqrt2} \vee x=\dfrac{9}{\sqrt2}}\\
x=-\dfrac{9\sqrt2}{2} \vee x=\dfrac{9\sqrt2}{2}}\\$

8 0

4 years ago

Rachel budgeted $76.50 for school clothes. This is 0.45 of her total budget. How much does Rachel have her total budget?

balu736 [363]

Let her total budget = x

0.45 x = 76.5 Divide by 0.45

0.45 x / 0.45 = 76.5 / 0.45

x = 170 dollars. I'm using a calculator. Are you allowed to do that?

6 0

4 years ago

The equation for a parabola has the form y=ax2+bx+c, where a, b, and c are constants and a≠0. Find an equation for the parabola

Shalnov [3]

Answer:

The equation for the parabola that passes through the points (−1,8), (2,−4), and (−6,−12) is $y = -x^{2}-3\cdot x +6$ .

Step-by-step explanation:

Let be (−1,8), (2,−4), and (−6,−12) points contained in a parabola, which is represented by a second-order polynomial. To determine the constant of the second-order polynomial, the following system of equations must be solved:

$a - b+c = 8$

$4\cdot a +2\cdot b +c = -4$

$36\cdot a -6\cdot b +c = -12$

There are several methods for solving this: Equalization, Elimination, Substitution, Determinant and Matrix. The solution of this system is: $a = -1$ , $b = -3$ and $c = 6$ . Hence, the equation for the parabola that passes through the points (−1,8), (2,−4), and (−6,−12) is $y = -x^{2}-3\cdot x +6$ .