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3 years ago

25 ÷ (x + 2) = 5 is an equation or expression

Mathematics

1 answer:

mario62 [17]3 years ago

7 0

The answer is an expression because you can not solve for x.

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A cup of coffee is cooling down such that its temperature is decreasing at a constant rate of 8% per minute. Let’s say the coffe

KengaRu [80]

Answer:

Temperature after 1 minute = 184 ° F

Step-by-step explanation:

starting temperature = 200 °F

rate of decrease = 8% per minute

Temperature lost = 8% of 200 = 8/100 × 200 = 0.08 × 200 = 16 °F

It therefore means that after 1 minute, the cup of coffee loses 16 °F,

∴ Temperature after 1 minute = (starting temperature) - (lost temperature)

= 200 - 16 = 184 °F

4 0

3 years ago

if there are 80 million millennials in the US and 84% give to charity. How many do not give to charity

MA_775_DIABLO [31]

I think you have to divide 80milion and 84

8 0

3 years ago

If 6 pounds of blueberries costs $16.50, is $1 for 2.75 pounds of blueberries true?

strojnjashka [21]

Step-by-step explanation:

Hmm I'm not sure but (no) I think

6 pounds = $16.50

1 pound = $16.50 ÷ 6

=$2.75

$16.50 = 6 pounds

$1 = 6 ÷ $16.50 = 4/11 pounds (0.36363636......)

5 0

3 years ago

Suppose a recent nationwide survey showed that 35% of American college students have traveled outside of the USA. But a well kno

Mariulka [41]

Answer:

Step-by-step explanation:

We would set up the hypothesis test.

For the null hypothesis,

p = 0.35

For the alternative hypothesis,

p > 0.35

This is a right tailed test considering the > in the alternative hypothesis.

Considering the population proportion, probability of success, p = 0.35

q = probability of failure = 1 - p

q = 1 - 0.35 = 0.65

Considering the sample,

Sample proportion, P = x/n

Where

x = number of success = 42

n = number of samples = 100

P = 42/120 = 0.42

We would determine the test statistic which is the z score

z = (P - p)/√pq/n

z = (0.42 - 0.35)/√(0.35 × 0.65)/100 z = 1.48

7 0

3 years ago

Water from a leaking faucet is dripping into a cylindrical cup. The height of water in inches, y, after x hours is graphed below

Ne4ueva [31]

Answer:

The value of y is two times the value of x

$y=2x$

Step-by-step explanation:

Let

y ----> the height in inches

x ----> the time in hours

we have the ordered pairs

(1, 2), (2, 4), and (3, 6).

step 1

Find the slope

take two points to calculate the slope

(2, 4), and (3, 6)

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

substitute

$m=\frac{6-4}{3-2}$

$m=\frac{2}{1}$

$m=2\ \frac{in}{h}$

step 2

Find the equation of the line in point slope form

$y-y1=m(x-x1)$

we have

$m=2$

$point\ (2,4)$

substitute

$y-4=2(x-2)$

Convert to slope intercept form

isolate the variable y

$y=2x-4+4\\y=2x$

Is a proportional relationship between the variable x and the variable y

therefore

The value of y is two times the value of x

6 0

3 years ago

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