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3 years ago

© A boy has N800. He spends N160. What

Mathematics

2 answers:

Gre4nikov [31]3 years ago

6 0

Answer: 4/5

Explanation:

800 - 160 = 640

640/800= 8/10 = 4/5

Anni [7]3 years ago

5 0

Answer:

4/5

Step-by-step explanation:

$800 - 160 = 640 \\ \frac{640}{800} = \frac{4}{5}$

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Given the area of a square is 225 square feet, what is the length of each side

alexdok [17]

The area of a square can be found by squaring one side.

Let's set the side as x feet.

x^2=225
x=square root of 225
x=15

The length of each side is 15 feet.

Hope this helps!
Your fortune is "Never throw away your shot."

7 0

3 years ago

Solve for x.

olga nikolaevna [1]

Answer:

$\boxed{x=5},x=-9$

Step-by-step explanation:

To rid the denominators, multiply both sides by $(x-3)(x+1)$ .

We get:

$6(x+1)-12(x-3)=(x-3)(x+1)$

Simplifying, we have:

$6x+6-12x+36=x^2-3x+x-3,\\-6x+42=x^2-2x-3,\\x^2+4x-45=0$

Solving, we get:

$x^2+4x-45=0,\\(x-5)(x+9)=0,\\x=5,x=-9$

Therefore, the solution with the greatest value is $x=\boxed{5}$

8 0

3 years ago

What is the maximum height of of Anna's golf ball? The equation is y=x−0.04x2.

elena-s [515]

Given:

The height of a golf ball is represented by the equation:

$y=x-0.04x^2$

To find:

The maximum height of of Anna's golf ball.

Solution:

We have,

$y=x-0.04x^2$

Differentiate with respect to x.

$y'=1-0.04(2x)$

$y'=1-0.08x$

For critical values, $y'=0$ .

$1-0.08x=0$

$-0.08x=-1$

$x=\dfrac{-1}{-0.08}$

$x=12.5$

Differentiate y' with respect to x.

$y''=(0)-0.08(1)$

$y''=-0.08$

Since double derivative is negative, the function is maximum at $x=12.5$ .

Substitute $x=12.5$ in the given equation to get the maximum height.

$y=(12.5)-0.04(12.5)^2$

$y=12.5-0.04(156.25)$

$y=12.5-6.25$

$y=6.25$

Therefore, the maximum height of of Anna's golf ball is 6.25 units.

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3 years ago

Lifetime Fitness charges $90 a month for membership plus $50 per session with a trainer. Which equation can be used to determine

Taya2010 [7]

Answer:

50x / 30/x i think

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

21/x=7 the solution

djyliett [7]

Step-by-step explanation:

×/21 x ×/21 = 7× x/21

x= 1/3

6 0

3 years ago