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3 years ago

Solve the equation: 25-3x=40A. -15B. -5C. -2D. -4

Mathematics

2 answers:

Mnenie [13.5K]3 years ago

6 0

Isolate the variable by dividing each side by factors that don't contain the variable.
-5

tresset_1 [31]3 years ago

3 0

B) -5

25-3x=40
-3x=15
x=-5

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A smart phone manufacturer uses 10 ounces of gold circuitry to make 5,200 smart phones. If they made 7,800 smart phones last mon

padilas [110]

Answer:

$19,500

Step-by-step explanation:

In this question, the first thing we do

Is to calculate the amount of gold that was used in making 7,800 smartphones. We proceed as follows:

Firstly, 10 ounces made 5,200 smartphones, then x ounces will make 7,800 smartphones

Thus 10 * 7,800 = 5,200 * x

x = 78,000/5200 = 15 ounces

This means that 7,800 smartphones were made using 15 ounces of gold

Now, we know that the value of an ounce is $1,300. Thus, the value of 15 ounces would be 15 * 1,300 = $19,500

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3 years ago

The number 75 can be written as the sum of the squares of 3 different positive integers. what is the sum of these 3 integers?

muminat

The square numbers smaller than 75 are 1, 4, 9, 16, 25, 36, 49, 64
1+49+25=75 seems to be the only set possible.
1+7+5=13
the answer is 13

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3 years ago

What’s the answer? I’ve been struggling with this one

bearhunter [10]

Answer:

I believe the answer is B

(please give brainliest, it helps a lot)

5 0

3 years ago

Drag each term to the correct location on the expression. each term can be used more than once, but not all terms will be used.

grandymaker [24]

Answer:

4(x-3)(x+6)

Step-by-step explanation:

We factor out the 4 first since all numbers are divisible by 4. That leaves us with x^2+3x-18.

Then we factor this to get (x-3)(x+6).

So the factored form of the equation is 4(x-3)(x+6)

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4 years ago

The manufacturer of the ColorSmart-5000 television set claims 95 percent of its sets last at least five years without needing a

Leya [2.2K]

Answer: (0.665 , 0.777)

Step-by-step explanation:

Given : Sample size of consumers: n=420 ;

Number of consumers say their ColorSmart-5000 television sets did not need a repair=303

The the sample proportion for consumers say their ColorSmart-5000 television sets did not need a repair : $\hat{p}=\dfrac{303}{420}\approx0.721$

Significance level : $\alpha:1-0.99=0.01$

Critical value = $z_{\alpha/2}=\pm2.576$

The confidence interval for population proportion is given by :_

$\hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}$

i.e. $0.721\pm (2.576)\sqrt{\dfrac{0.721(1-0.721)}{420}}$

$\approx0.721\pm 0.056=(0.721-0.056,0.721+0.056)\\\\=(0.665\ ,\ 0.777)$

Hence, a 99 percent confidence interval for the proportion of all ColorSmart-5000 television sets that have lasted at least five years without needing a single repair = (0.665 , 0.777)

7 0

3 years ago

Solve the equation: 25-3x=40A. -15B. -5C. -2D. -4​

Solve the equation: 25-3x=40A. -15B. -5C. -2D. -4