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3 years ago

Serena drew a circle with a circumference of 157 centimeters. What is the approximate diameter of the circle she drew

Mathematics

2 answers:

madam [21]3 years ago

7 0

Answer:

50cm

Step-by-step explanation:

Arturiano [62]3 years ago

7 0

Answer:

50 cm

Step-by-step explanation:

Circumference = $2\pi r$

$2\pi r$ = 157

$\frac{2* 22 r}{7}$ = 157

r = 157 * 7 / 44

r = 24.97 cm

r can be rounded to 25cm

so the diameter = 50cm

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skelet666 [1.2K]

It can go up to four dimensional.

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3 years ago

4% of what number is 5

Papessa [141]

4%n = 5

Simplify the equation

1/25n = 5

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3 years ago

Read 2 more answers

There are 162 magazines and books in a library. There are 54 more books

Strike441 [17]

Answer:

108 books.

Step-by-step explanation:

Let the number of magazines = m

Let the number of books = b

Given the following data;

Total number of m & b = 162

Translating the word problem into an algebraic equation, we have;

$b = m + 54$ ......equation 1

$m + b = 162$ ......equation 2

Substituting equation "1" into equation "2" we have;

$m + m + 54 = 162$

$2m + 54 = 162$

$2m = 162 - 54$

$2m = 108$

$m = \frac {108}{2}$

m = 54

Now to find the number of books;

$b = m + 54$

Substituting the value of "m" into the equation, we have;

$b = 54 + 54$

b = 108

Therefore, the total number of books in the library is 108 books.

7 0

3 years ago

The junior and senior classes at Central High School were asked to choose a destination for a field trip. The results are shown

Ann [662]

Solution:

We are given below frequency table:

Amusement-Park Museum Broadway-Show Total

Juniors 57 21 42 120

Seniors 64 44 58 166

Total 121 65 100 286

We have to find the percentage of surveyed students who chose the amusement park.

From the table, we see there are total 121 students who chose amusement park out of total 286 students.

Therefore, the percentage of surveyed students who chose the amusement park is given below:

$\frac{121}{286}\times 100=42.3\%$

Hence, the option A. 42.30% correct.

3 0

3 years ago

X² + y² = 8

ohaa [14]

Answer:

$(2,2)~ \text{and}~ (-2,-2)$

Step by step explanation:

$x^2 +y^2 =8~~~~~~...(i)\\\\x-y=0~~~~~~~~~...(ii)\\\\\text{From (ii):}\\\\x-y = 0 \implies x = y\\\\\text{Substitute x = y in eq (i):}\\\\~~~~~~y^2 +y^2 =8\\\\\implies 2y^2 = 8\\ \\\implies y^2 = \dfrac 82\\\\\implies y^2 = 4\\\\\implies y = \pm\sqrt 4\\\\\implies y = \pm 2\\\\\text{Substitute y = x in equation (i):}\\ \\~~~~~~x^2 +x^2 = 8\\ \\\implies 2x^2 = 8\\\\\implies x^2 = \dfrac 82\\\\\implies x^2 = 4\\\\\implies x = \pm\sqrt 4\\\\\implies x = \pm2\\\\$

$\text{Hence,}~ (x,y) = (\pm2, \pm 2)$

3 0

2 years ago