3 years ago

Twice a number subtracted from four times a number, added to 15? anyone help?

Mathematics

1 answer:

Wittaler [7]3 years ago

7 0

Answer:

2x - 4y + 15

Step-by-step explanation:

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A substance has a mass of 10g and a volume of 5cm^3 whats the density

sergiy2304 [10]

Density= Mass/Volume
10/5=2

If I'm correct the density should be 2 cm^3

7 0

3 years ago

) If the gradient of ff is ∇f=xi⃗ +yj⃗ +3zyk⃗ ∇f=xi→+yj→+3zyk→ and the point P=(−6,−6,−2)P=(−6,−6,−2) lies on the level surface

Paha777 [63]

Answer:

-3x-3y-z=38

Step-by-step explanation:

To find the equation of the tangent plane you can use

$\bigtriangledown f_x(x_0,y_0,z_0)(x-x_0)+\bigtriangledown f_y(x_0,y_0,z_0)(y-y_0)+\bigtriangledown f_z(x_0,y_0,z_0)(z-z_0)=0$

the point P is (-6,-6,-2). Hence you have

$(-6)(x-(-6))+(-6)(y-(-6))+(-2)(z-(-2))=0\\-6x-36-6y-36-2z-4=0\\-6x-6y-2z=76\\-3x-3y-z=38$

hope this helps!!

5 0

3 years ago

By the time shana had completed 3/8 of her first lap in a race, she had also completed 1/32 of the entire race. How many laps we

Yuri [45]

3/8 of a lap is 1/32 of the entire race.
x - the number of laps in the race

$\frac{3}{8}=\frac{1}{32}x \\
\frac{3}{8} \times 32=x \\
3 \times 4=x \\
x=12$

There were 12 laps in the race.

3 0

3 years ago

Which expression is equivalent to 19/39?

Alex

As long as u multiply both the numerator and denominator by the same number, it will be equal.

6 0

3 years ago

Read 2 more answers

If α and β are the zeroes of the polynomial ax^2 + bx + c, find the value of α^2 + β^2

Pie

Answer:

Step-by-step explanation:

α + β = -b/a

αβ = c/a

α² + β² = (α + β)² - 2αβ

$= (\frac{-b}{a})^{2}-2\frac{c}{a}\\\\= \frac{b^{2}}{a^{2}}-\frac{2c}{a}\\\\=\frac{b^{2}}{a^{2}}-\frac{2c*a}{a*a}\\\\=\frac{b^{2}-2ca}{a^{2}}$

7 0

3 years ago