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Vika [28.1K]
3 years ago
12

-3r + 8 + 2r = -1. What is the value of r?

Mathematics
2 answers:
SashulF [63]3 years ago
8 0

-3r+8+2r=-1

-3r+2r=-1-8

-3r=-9r=9

barxatty [35]3 years ago
8 0

Answer:

r=9

Step-by-step explanation:

-3r+8+2r=-1

-3r+2r+8=-1

-r+8=-1

-r+8-8=-1-1

-r=-9

-r/-1=-9/-1

r=9

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svetlana [45]

Answer:

c

Step-by-step explanation:

one full drink or 2 oz. is two grams so a half a drink or four oz. is 1 gram and a drink and a half or 12 oz. is 3 grams

3 0
3 years ago
2550 gallons in 30 days
Lena [83]

Answer:

85

Step-by-step explanation:

by dividing 2550 from 30

3 0
4 years ago
Which graph below shows a line that contains ordered pairs that are solutions of the equation shown?
Vinvika [58]

Given:

The equation is:

y=-x+4

To find:

The graph of the line that contains ordered pairs that are solutions of the given equation.

Solution:

We need to find the graph of the given equation.

We have,

y=-x+4

At x=0, we get

y=-0+4

y=4

So, the x-intercept of the given equation is at point (0,4).

At y=0, we get

0=-x+4

x=4

So, the y-intercept of the given equation is at point (4,0).

From the given graphs it is clear that the line in option C has x-intercept at point (0,4) and y-intercept at point (4,0).

Therefore, the correct option is C.

7 0
3 years ago
The formula F= 9 5 ( C)+32 converts a temperature reading from Celsius into Fahrenheit. What does 20° C convert to in terms of d
Helga [31]

Answer:

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Step-by-step explanation:

8 0
3 years ago
Change the Cartesian Integral into an equivalent polar integral then evaluate the polar integral.
Elis [28]

Answer:

the ingegral I=π/4

Step-by-step explanation:

From the integral

I=∫0-1∫0-sqrt(1-y^2) (x^2 + y^2) dxdy

from polar coordinates

r²=x² + y²

then for r=1

√(1- y²) = x

for y=1 → x=0 , for y=0 → x=1

then the integration area is a hemisphere or radius r=1

therefore

I= ∫0-1∫0-sqrt(1-y^2) (x^2 + y^2) dxdy = (1/2)∫2π-0 ∫1-0 r² *r drdθ ( the additional r is due to the Jacobian of the transformation to polar coordinates , 1/2 because is an hemisphere so it would be the half of the value of the total sphere)

I= (1/2)∫2π-0 ∫1-0 r³drdθ = (1/2)∫2π-0 (1⁴/4 - 0⁴/4) dθ = (1/2)∫2π-0 (1/4)*dθ = (1/2)*(1/4)*2π = π/4

3 0
4 years ago
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