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2 years ago

Ayudaaaaaaaaaaaaaaaaaaa! Por favor

Mathematics

1 answer:

KiRa [710]2 years ago

3 0

Answer:

Step-by-step explanation:

$diameter~d=\sqrt{9^2+5^2} =\sqrt{106} \\r=\frac{\sqrt{106} }{2} \\area=\pi (\frac{\sqrt{106} }{2} )^2=53\pi /2 \approx 83.21~square~units.$

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A girls hair is 12 3/8 inches long if she had 2 1/2 inches cut off how long will her hair be ?

Darya [45]

Answer: 9 and 7eights

Step-by-step explanation: Divide using long division. The whole number portion will be the number of times the denominator of the original fraction divides evenly into the numerator of the original fraction, and the fraction portion of the mixed number will be the remainder of the original fraction division over the denominator of the original fraction. Which would equal, 9 and 7eights.

5 0

3 years ago

The area of a rectangular pool is 6992 m².

Nina [5.8K]

Step-by-step explanation:

area=6992m2

length=92m

Now,

area of rectangle=6992

3 0

2 years ago

What is the value of x??

Feliz [49]

Answer:

I. 5

Step-by-step explanation:

140° and 8x° are on the straight angle and they are both equal 180°

to find the value of x:

140 + 8x = 180

8x = 180 - 140

8x = 40

x = 40/8

x = 5

4 0

2 years ago

Write the equation in slope-intercept form: 4x -2y =12

DedPeter [7]

$4x - 2y = 12 \\ \: \: \: \: \: \: \frac{ - 2y}{ - 2} = \frac{ - 4x}{ - 2} \: + \frac{12}{ - 2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: y = 2x - 6$

Therefore, the answer is 1) y = 2x - 6

3 0

3 years ago

The ratio of Wei Ling's age to Wei Xuan's age 5 years ago was 2: 5. In 9 years

Archy [21]

Answer:

15 years old

Step-by-step explanation:

Start by defining the variables that we are going to use throughout our working:

Let the current age of Wei Ling and Wei Xuan be L and X years old respectively.

Next, form equations using the given information.

5 years ago

Wei Ling: (L -5) years old

Wei Xuan: (X -5) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan's is 2: 5,

$\frac{ L - 5}{X - 5} = \frac{2}{5}$

Cross multiply:

2(X -5)= 5(L -5)

Expand:

2X -10= 5L -25

2X= 5L -25 +10

2X= 5L -15 -----(1)

9 years time

Wei Ling: (L +9) years old

Wei Xuan: (X +9) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan is 3: 4,

$\frac{L + 9}{X + 9} = \frac{3}{4}$

Cross multiply:

3(X +9)= 4(L +9)

Expand:

3X +27= 4L +36

3X= 4L +36 -27

3X= 4L +9 -----(2)

Let's solve using the elimination method.

(1) ×3:

6X= 15L -45 -----(3)

(2) ×2:

6X= 8L +18 -----(4)

(3) -(4):

6X -6X= 15L -45 -(8L +18)

0= 15L -45 -8L -18

0= 7L -63

7L= 63

L= 63 ÷7

L= 9

Substitute L= 9 into (1):

2X= 5(9) -15

2X= 45 -15

2X= 30

X= 30 ÷2

X= 15

Thus, Wei Xuan is 15 years old now.

6 0

2 years ago