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2 years ago

Evaluate 2x-7 when x=5

Mathematics

2 answers:

katovenus [111]2 years ago

5 0

2(5)-7 = 10 - 7 = 3

3 is the answer

Hope this helped!

Nate

MArishka [77]2 years ago

5 0

the answer should be 3

let x=5

2x-7 = (2*5)-7 = 10-7 = 3

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Jamar drove 228 miles and used 6 gallons of gas.

Klio2033 [76]

Step-by-step explanation:

well, it is kind of written already :

228 miles and 6 gallons.

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so, again

38 miles/gallon

and he used 9 gallons.

so, he drove 38×9 = 342 miles

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2 years ago

Translate the description as an algebraic expression:<br> 5 more than the sum of 11 and b

e-lub [12.9K]

x= (11+b)+5

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3 years ago

70 POINTS !! Charlotte has a map of the village. The scale on the map is such that 1cm represents 25m.

Natasha_Volkova [10]

Answer:

A. 175 m

B. 20 cm

Step-by-step explanation:

$\frac{1 cm}{25 m} =\frac{7 cm}{x m}$

x = 175 m

$\frac{25 m}{1 cm} = \frac{500 m}{x cm}$

x = 20 cm

5 0

1 year ago

Read 2 more answers

A spherical balloon is inflated with gas at the rate of 500 cubic centimeters per minute. How fast is the radius of the balloon

zmey [24]

Using implicit differentiation, it is found that the radius is increasing at a rate of 0.0081 cm per minute.

<h3>What is the volume of a sphere?</h3>

The volume of a sphere of radius r is given by:

$V = \frac{4\pi r^3}{3}$

Applying implicit differentiation, the rate of change is given by:

$\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt}$

In this problem, we have that:

$\frac{dV}{dt} = 500, r = 70$

Hence the rate of change of the radius is given as follows:

$\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt}$

$19600\pi\frac{dr}{dt} = 500$

$\frac{dr}{dt} = \frac{500}{19600\pi}$

$\frac{dr}{dt} = 0.0081$

The radius is increasing at a rate of 0.0081 cm per minute.

More can be learned about implicit differentiation at brainly.com/question/25608353

#SPJ1

4 0

1 year ago

The Johnson twins were born four years after their older sister. This year, the product of the three siblings ages is exactly 34

svp [43]

Answer:

Step-by-step explanation:

Let age of each twin be x

let age of sister be s

So we can write:

x + 4 = s

The product of the 3 siblings ages is 3482 more than sum. We can write:

$s*x*x=3482+(s+x+x)$

This can be simplified as:

$sx^2=3482+s+2x$

We replace s with "x + 4" and solve:

$(x+4)x^2=3482+x+4+2x\\x^3+4x^2=3486+3x\\x^3+4x^2-3x-3486=0\\x=14$

<u>Note:</u> To solve this cubic, we used technology

Thus, we can say the twins are 14 years old

3 0

3 years ago