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3 years ago

70 POINTS!! AND BRAINLIEST HELPPPPP!!!

Mathematics

2 answers:

DerKrebs [107]3 years ago

6 0

Answer:

3000 girls
38 fishes
37 points
115 marbles
19 gray coloured cars

Step-by-step explanation:

Let the unknown values be x

30 class mates = 1 class room

18 girls in 1 classroom

18 girls in 30 classmates

x girls in 5000 class mates

$18\:girls= 30\:students\\x\:girls = 5000\:students\\\\Cross\:Multiply\\\\30x = 90000\\\\Divide\:both\:sides\:by\:30\\\frac{30x}{30} = \frac{90000}{30}\\ \\x = 3000\\= 3000 girls$

$2.5\:miles = 12 \:fishes\\8\:miles = x\:fishes\\\\Cross\:Multiply\\2.5x = 96\\\\Divide\:both\:sides\:of\:the\:equation\:by\:2.5\\\\\frac{2.5x}{2.5}=\frac{96}{2.5}\\ \\x = 38.4\\Approximately \: =38\:fishes$

$8\:minutes = 14\: points\\21 \:minutes = x \:points\\\\Cross\:Multiply\\8x = 294\\\\\mathrm{Divide\:both\:sides\:by\:}8\\\frac{8x}{8}=\frac{294}{8}\\\\Simplify\\x=\frac{147}{4}\\\\x = 36.75\\\\Approximately\:= 37\:points$

$32\:marbles = 5\:inches\\x\:marbles = 18\:inches\\\\Cross\:Multiply\\5x = 576\\\\\mathrm{Divide\:both\:sides\:by\:}5\\\frac{5x}{5}=\frac{576}{5}\\\\x=\frac{576}{5}\\\\x =115.2\\= 115=\:marbles$

$2 \: gray\:colour= 15\:cars\\x\:gray= 140\:cars\\\\Cross\:Multiply\\\\15x = 280\\\\\mathrm{Divide\:both\:sides\:by\:}15\\\frac{15x}{15}=\frac{280}{15}\\\\Simplify\\x=\frac{56}{3}\\\\x =18.666\\Approximately ;\\19$

const2013 [10]3 years ago

6 0

Answer:

4. 300 girls

5. 38 fish

6. 36 points

7. 115 marbles

8. 18 gray colored cars

Step-by-step explanation:

30 = 500

18G x

30x = 500 (18)

x = 300 girls

---------------------------------

2.5 mils = 8 miles

12 fish x

2.5x = 8 (12)

x = 96/2.5

x = 38 fish

---------------------------------

8 mins = 21 mins

14 points x

8x = 21 (14)

x = 294/8

x = 36 points

---------------------------------

32 marbles = x

5 inches 18 inches

5x = 32 (18)

x = 576 / 5

x = 115 marbles

---------------------------------

140 cars = 15 cars

x 2 gray

15x = 140 (2)

x = 280 / 15

x = 18 gray colored cars

---------------------------------

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3 years ago

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madreJ [45]

Answer:

a = 50°, b = 130°, c = 20°

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

Sum the 3 angles in the right triangle

a + 40° + 90° = 180°

a + 130° = 180° ( subtract 130° from both sides )

a = 50°

a and b are adjacent angles and sum to 180° , so

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