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3 years ago

Can someone help me with this circle geometry problem (question 1) ty

Mathematics

1 answer:

Alona [7]3 years ago

8 0

Step-by-step explanation:

1. Radius=3cm, diameter=6cm

Circumference=3.14×6cm=18.84cm

2. Radius=6in, diameter=12in

Circumference=3.14×12in=37.68in

3. Radius=9mm, diameter=18mm

Circumference=3.14×18mm=56.52mm

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A car travels 312 miles in the same time that a motorcycle traveled 272. If the cars speed is 10mph more than the motorcycles, f

dimaraw [331]

Answer: speed of the car is 88 miles per hour

the speed of the motorcycle is 78 miles per hour

Step-by-step explanation:

Number of miles travelled by car = 312

Number of miles travelled by motorcycle = 272

Let x = speed of the car

Let y = speed of the motorcycle

If the car's speed is 10mph more than the motorcycle's, it means

x = y + 10 - - -- - - 1

Time taken for car to travel 312 miles is distance /speed = 312/x

Time taken for motorcycle to travel 272 miles is distance /speed = 272/y

The car travels 312 miles in the same time that a motorcycle traveled 272.

This means

312/x = 272/y

312y = 272x

y = 272x/312

Substituting y = 272x/312 into equation 1, it becomes

x = 272x/312 + 10

312x = 272x + 3120

312x-272x = 3120

40x = 3120

x = 3120/40 = 78 miles per hour

x = y + 10 = y + 78

x = 88 miles per hour

3 0

3 years ago

The scale on a road map indicates that 2 inches = 30 miles. How many inches would represent 120 miles on this road map?

qwelly [4]

In:mi

2 = 30

x = 120

2/30=x/120

(Cross Multiply)

30x= 240

30x/30=240/30

X=8

8 0

3 years ago

In a deck of cards what's the probability of drawing a Face Card (king, queen, jack)

Bumek [7]

Answer:

3/13

Step-by-step explanation:

There are 52 card in a deck of cards

12 of them are face cards 3 cards *4 suits =12

P (face card) = 12/52 = 3/13

3 0

3 years ago

Read 2 more answers

What is the slope of the line below? Give an exact number

Maksim231197 [3]

Answer:

-2 by 1

Step-by-step explanation:

idk

4 0

3 years ago

Read 2 more answers

Can someone explain and answer please??

Nat2105 [25]

Simplify the ration expression
$\frac{3x-6}{x-2}$

start by seeing if anything in the numerator or denominator can be factored,
you should notice that you can factor out a 3 from 3x-6 in the numerator

when you do so, the result is
$\frac{3 *(x-2)}{x-2}$

now, since there is an x-2 in the numerator and denominator, they "cancel" out since

$\frac{x-2}{x-2} =1$
however, only when $x \neq 2$
since $\frac{0}{0} \neq 1$

when you cancel out the x-2, you're left with 3

hence, your answer is C

8 0

3 years ago