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3 years ago

Find the value of x. * Please help

Mathematics

1 answer:

scZoUnD [109]3 years ago

7 0

Answer:

x = 78

Step-by-step explanation:

(x-8) + 20 = 90

x - 8 = 90 - 20

x - 8 = 70

x = 70 + 8

x = 78

Check:

(78-8) + 20 = 90

70 + 20 = 90

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5-2x/3=x solve for x

Mrrafil [7]

5-2x/3-5=x-5

-2x/3=x-5

-2x=3x-15

-5x=-15

Answer: x=3

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3 years ago

Lucinda is saving money for a hot-air balloon trip to celebrate her graduation. She needs $300 dollars. Express this amount as a

lora16 [44]

Answer:

Positive number

Step-by-step explanation:

Given that:

Lucinda is saving money for a hot-air balloon trip to celebrate her graduation and she needs $300 dollars.

Let x be the amount of her savings and she needs $300

SO;

x + 300 = 0

As an integer, it is represented by a positive number because she needs this amount of money in addition to what she already saved.

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2 years ago

A tangent line and its normal line have a point of tangency to the function f(x) at (x,y). If the slop of the normal line is m=(

alekssr [168]

Answer:

$\displaystyle \\\left(\frac{49}{900},\frac{3761}{900}\right)$ or approximately (0.544, 4.179)

Step-by-step explanation:

A function and its tangent lines intersect when their slopes are the same. Find the x-coordinate when the slope of f(x) is equal to 8/7 by taking the derivative of f(x):

$\displaystyle\\f(x)=\sqrt{x}-x+4\\f'(x)=\frac{1}{2}\cdot\frac{1}{\sqrt{x}}-1=\frac{1}{2\sqrt{x}}-1$

Set $f'(x)$ equal to 8/7 and solve for x:

$\displaystyle \\\frac{1}{2\sqrt{x}}-1=\frac{8}{7},\\x=\frac{49}{900}$

Therefore, $f(x)$ will intersect at a point of tangency with a line of slope 8/7 at x=49/900. Plug in x=49/900 into $f(x)$ to get the y-coordinate:

$\displaystyle\\y=\sqrt{x}-x+4 \vert_{x=49/900}=\frac{3761}{900}$

⇒Answer: (49/900, 3761/900) or approximately (0.544, 4.179)

5 0

2 years ago

1.-si el area de un rectangulo es de 144 metros cuadrados y su altura de 8 metros ¿ cual es el valor de su base?

kari74 [83]

Step-by-step explanation:

FÓRMULA:

$144 m^{2}$ = b(8 m)

SE DESPEJA

b = $144 m^{2}$ /8 m = 18 m

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3 years ago

Part A The year in which the US Civil War ended was 25 percent later than the year Christopher Columbus set sail from Spain. If

IRINA_888 [86]

Answer:

0.25 c to the second

Step-by-step explanation:

i think

3 0

2 years ago