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san4es73 [151]
3 years ago
11

Jeanne thinks that x+x is the same as x•x. Is this true? Why? Why not?

Mathematics
2 answers:
NARA [144]3 years ago
6 0
Generally, x <span>• x is accepted to mean "x times x" or "x multiplied by x"

and x+x means "x plus x" or "x added to x"

let's try by subsituting numbers for them
if we can find one case where the statement "x+x is the same as x</span><span>•x" is false, then it is not true


let's try x=4
x+x=x</span><span>•x
4+4=4</span>•<span>4
8=16
false



so it is not true
(x+x is equal to 2x, so therefor if we were to solve 2x=x</span><span>•x, we would get that it is only true for x=2 and x=0)

it is not always true
</span>
quester [9]3 years ago
6 0

It depends on the number. Generally, it is false, expect in a few certain cases, such as 2 for example, as:

2 + 2 = 4

2 x 2 = 4

however, most other numbers do not work, such as, for example, 5

5 + 5 = 10

5 x 5 = 25

So it really depends on what "x" is.

hope this helps

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What is the area of the triangle​
Lina20 [59]

Answer:

Use this to answer your question :)

Step-by-step explanation:

The area of a triangle is defined as the total region that is enclosed by the three sides of any particular triangle. Basically, it is equal to half of the base times height, i.e. A = 1/2 × b × h.

5 0
2 years ago
The perimeter of a rectangle is 84 feet. the length is two feet greater than 3 times the width. Find the length and width. Draw
Kipish [7]
The formula for a rectangle's perimeter is

P = 2l + 2w

We know the length is 2 ft greater than thrice the width, so 2l becomes:

3w + 2ft + 3w + 2ft

Substitute.

P = 3w + 2ft + 3w + 2ft + 2w

Add like terms.

P = 8w + 4ft

Substitute P.

84 ft = 8w + 4ft

Subtract 4 ft from both sides to eliminate. (Property of equality)

84 ft - 4ft = 8w + 4ft - 4ft
80 ft = 8w

Divide 8 on both sides to isolate w.

80 ft / 8 = 8w / 8

10 ft = w

We have the value of w, now look for the l which we know is 2 feet more than thrice the value of w.

l = 10 ft × 3 + 2 ft
l = 30 ft + 2 ft
l = 32 ft

Therefore, the length and the width of the rectangle is 10 ft (w) and 32 ft (l).

Check:
84 ft = (2) (10 ft) + (2) (32 ft)
84 ft = 20 ft + 64 ft
84 ft = 84 ft ✔

♧
4 0
3 years ago
A stuffed animal that originally cost $120 is on sale for $80. By what percent has the original cost been reduced
Otrada [13]

Answer:

The cost has been reduced by approximately 33%.

Step-by-step explanation:

1% of 120 is 1.2.

80 divided by 1.2 is 66.66666666...

Meaning that $80 is about 66% of the original cost. Therefore, about 33% of the cost was removed.

Hope this helps

5 0
2 years ago
Estimate the value of this expression by rounding each number to the nearest whole unit. (1.74)(9.95)(3.46) A. 80 B. 54 C. 60 D.
Vlada [557]
The answer is C. 60 because if you multiply 1.74*9.95*3.46 you will get 59.90298 and if you round to the nearest whole then it's 60
4 0
3 years ago
The speed of cars on a stretch of road is normally distributed with an average 51 miles per hour with a standard deviation of 5.
Oliga [24]

Answer: 0.57

Step-by-step explanation:

Given : The speed of cars on a stretch of road is normally distributed .

Population Mean = \mu=51\text{ miles per hour}

Standard deviation : \sigma= 5.9\text{ miles per hour}

Let x be the random variable that represents the speed of cars on a stretch of road .

z-score : z=\dfrac{x-\mu}{\sigma}

For x= 50.

z=\dfrac{50-51}{5.9}\approx-0.17

By using the standard normal distribution table ,

The probability that a randomly selected car is violating the speed limit of 50 miles per hour :-

P(x>50)=1-P(x\leq50)=1-P(z\leq-0.17)\\\\=1- 0.4325051=0.5674949\approx0.57\\

5 0
3 years ago
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