3 years ago

Jim adds 20 to it, then doubles it and gets an answer of 99.2. What was the original number?

Mathematics

1 answer:

riadik2000 [5.3K]3 years ago

7 0

(n+20)*2 = 99.2

distribute

2n + 40 = 99.2

subtract 40 from each side

2n = 59.2

divide each side by 2

n = 29.6

You might be interested in

Imagine that * represents a new operation so that a * b means to double a, and then add b. For example, 2 * 10 = 14. What is -3

Rudik [331]

Answer:

C 2

Step-by-step explanation:

-3 doubled = -6

-6 +8 = 2 so C 2

4 0

3 years ago

Read 2 more answers

Wally is rebuilding his fence. Each section of the fence will have 12 vertical boards that are each eight inches wide. He’s goin

Leokris [45]

Answer:

Part A)

Each diagonal is about 9.43 feet.

Part B)

In total, Wally needs about 736.02 feet of wood.

Step-by-step explanation:

Part A)

Since each vertical board has a width of 8 inches, for one section with 12 vertical boards, the total width will be 8(12) = 96 inches.

96 inches is the same as 96/12 = 8 feet.

We are also given that the horizontal pieces will be 5 feet apart.

To find the diagonal, we can use the Pythagorean Theorem. The 8 is the base and 5 is the height. Therefore:

$\displaystyle d^2=8^2+5^2$

Compute:

$d^2=89$

Taking the square root, we acquire:

$\displaystyle d=\sqrt{89}\approx9.43 \text{ feet}$

So, each diagonal is about 9.43 feet.

Part B)

For each section, we have two horizontal pieces (each 8 feet) and one diagonal piece (each √89 feet).

Therefore, for one section, we will need a total of:

$\displaystyle L=8+8+\sqrt{89}=16+\sqrt{89}$

Then for 30 sections, we will need:

$T=30(16+\sqrt{89})$

Approximate:

$T\approx 763. 02$

Wally will need about 736.02 feet of wood in total.

3 0

3 years ago

use the polygon tool to draw an image of the given polygon under a dilation with a scale factor of 1/3 and center of dilation at

Sveta_85 [38]

Answer:

x-y and AxR

Step-by-step explanation:

5 0

2 years ago

If two lines intersect at right angles, then the two lines are perpendicular. hypothesis or conclusion

iragen [17]

Because there is an "if" this would make it a hypothesis.

3 0

3 years ago

All of the following are acceptable ways to name the angle shown except?

AnnyKZ [126]

Step-by-step explanation:

where is figure man

.....

5 0

2 years ago

Read 2 more answers