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3 years ago

Multiple choice please help me ( links = report )

Mathematics

2 answers:

liq [111]3 years ago

5 0

Answer:

Im gonna have to go with C :452.4 cm

Step-by-step explanation:

If this answer is correct please put me as brainliest, Thank you!

-Brainly User

mamaluj [8]3 years ago

4 0

Answer:

Hello Love! In this problem it gives you the diameter but when doing area we need the radius and remember radius is always half of the diameter so we are going to get 12 as are radius and square it so 12 × 12 = 144 now we just multiply by pi so 144 × 3.14 = 452.16 but sense we are rounding it it will be 452.4 so our answer is C

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allsm [11]

Answer: 2 hours

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3 years ago

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3 years ago

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3 years ago

Justin bought some yarn from his favorite craft store. He can make one scarf with 3/5 of a ball of yarn. If he purchases 15 ball

Elena L [17]

He can make 25 scarves from 15 balls of yarn.

Step-by-step explanation:

Given,

Yarn used for one scarf = $\frac{3}{5}$ of a ball

Yarn purchased = 15 balls

Let,

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Yarn used for one scarf*number of scarves = Yarn purchased

$\frac{3}{5}x=15$

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$\frac{5}{3}*\frac{3}{5}x=15*\frac{5}{3}\\x=\frac{75}{3}\\x=25$

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8 0

3 years ago

With her motorboat at full speed Dawn gets to her fishing hole, which is 21 miles upstream, in 2 hours. The return trip takes 1.

Vikentia [17]

Answer:

Speed_still = 12.25 mi/h

Speed_current = 1.75 mi/h

Step-by-step explanation:

In the first trip, the motorboat goes upstream

Speed_boat = Speed_still - Speed_stream

The speed is defined as

Speed = Distance / time

This means

Speed_boat = 21 miles/ 2 h = 10.5 mi/h

Then

Speed_still - Speed_stream = 10.5 mi/h

In the second trip:

Speed_boat = Speed_still + Speed_stream

Speed_boat = 21 miles/ 1.5 h = 14 mi/h

Speed_still + Speed_stream = 14 mi/h

Then, the ystem of equations result

Speed_still + Speed_stream = 14 mi/h

Speed_still - Speed_stream = 10.5 mi/h

If we add them together

2*Speed_still = 24.5 mi/h

Speed_still = 12.25 mi/h

Speed_stream = 14 mi/h - 12.25 mi/ h = 1.75 mi/h

3 0

3 years ago