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3 years ago

If 2d + 10 = 50, what does d equal?

Mathematics

2 answers:

Sindrei [870]3 years ago

7 0

Answer:d=20

Step-by-step explanation:

Step 1: Subtract 10 from both sides.

2d+10−10=50−10

2d=40

Step 2: Divide both sides by 2.

2/d=40/2

d=20

Musya8 [376]3 years ago

5 0

Answer:

d = 20

Step-by-step explanation:

2d + 10 = 50 ( subtract 10 from both sides )

2d = 40 ( divide both sides by 2 )

d = 20

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Is -5 2/3 the multiplicative inverse of 3/-17? <br><br>PLEASE HELP!!

Ostrovityanka [42]

Answer:

Yes

Step-by-step explanation:

Multiplicative Inverse of rational number:

When we multiply a rational number and its multiplicative inverse, we get 1

$\sf -5 \dfrac{2}{3}=\dfrac{-17}{3}$

Now,multiply this with (3/-17)

$\sf \dfrac{-17}{3}*\dfrac{3}{-17} = 1$

So, -5 2/3 is the multiplicatice inverse of 3/-17

3 0

2 years ago

A dog weighs 20% more than it did three months ago. It weighs 36 pounds now. How much did the dog weigh three months ago?

Arada [10]

Answer: 30 pounds
Step-by-step explanation:
Let the weight 3 month ago be X.
20% more than x is:
1.2x

We now have the following equation:
1.2x = 36
x = 36/1.2
x = 30 pounds

Hope that helps! Have a good day :)

6 0

3 years ago

I NEED HELP ASAP PLEASEEEE

spin [16.1K]

Answer:

Step-by-step explanation:

1) Find the Mean of all the numbers.

3+4+5+7+10+12+15=56

56/7=8 mean is 8

Now We Calculate Standard Deviation:

S= $\sqrt{(3-8)^2+(4-8)^2+(5-8)^2+(7-8)^2+(10-8)^2+(12-8)^2+(15-8)^2}$

You take each number from the problem i.e 3,4,5...

and then you subtract the mean from it and then square it.

S= $\sqrt{(-5)^2+(-4)^2+(-3)^2+(-1)^2+(2)^2+(4)^2+(7)^2}$

S= $\sqrt{25+16+9+1+4+16+49}$

S= $\sqrt{120}$

S= $\sqrt{120}/7$

7 is the amount of data units given in the problem.

120/7=17.1428571429

$\sqrt{17.1428571429}$ =4.1403933560541

Nearest hundredth=4.14

5 0

3 years ago

1 point

postnew [5]

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$(3 \times 25 )+ 60 = 75 + 60 =$

$135$

Thus Lisa spent 135 $ .

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3 0

3 years ago

Read 2 more answers

Which pair of lines is parallel? A. y=4x+1 and y+4=5 B. y=-2+x and 2y-2x=-2 C. y=1/4x + 2 and y-2=1/2x D. y=1/5x+1 and 5y+x= 10

sdas [7]

Answer:

B. y=-2+x and 2y-2x=-2

Step-by-step explanation:

Two lines are parallel if they have the same slope.

The equation 0of a line is tipically written as y=mx + b, where 'm' represents the slope and 'b' the y-intercept.

Let's evaluate each of the options:

A. y=4x+1 and y+4x=5

Writing the equations in the slope-intercept form, we get:

y=4x+1 → m=4

y=5-4x → m=-4

Given that they have different slopes, they are not parallel.

B. y=-2+x and 2y-2x=-2

Writing the equations in the slope-intercept form, we get:

y=-2+x → m=1

y=-1 + x → m=1

Given that the equations have the same slope, they are parallel.

C. y=1/4x + 2 and y-2=1/2x

Writing the equations in the slope-intercept form, we get:

y=1/4x + 2 → m=1/4

y=1/2x+2 → m=1/2

Given that they have different slopes, they are not parallel.

D. y=1/5x+1 and 5y+x= 10

Writing the equations in the slope-intercept form, we get:

y=1/5x+1 → m=1/5

5y+x= 10 → y=2 - 1/5x → m=-1/5

Given that they have different slopes, they are not parallel.

4 0

3 years ago