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2 years ago

Question 4, plz help ( radius is 6.8)

Mathematics

1 answer:

Kisachek [45]2 years ago

4 0

Answer:

A) 145.3 cm^2

Step-by-step explanation:

The formula for the area of a circle is A = π r^2

So to find the area we would plug the radius of 6.8 into the formula

Area = π (6.8)^2

Area = (3.14) (6.8)^2

Area = 145.27

Area = 145.3

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Dora is building the right square pyramid shown in the diagram.

saul85 [17]

Answer is 4 :) I hope it help you.

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2 years ago

The temperature of a pot of hot water is 200.5. The temperature of the water decreases 3.5 per minute. What is the temperature o

irina1246 [14]

Answer:

The temperature of the liquid 15 minutes later is $151.5$

Step-by-step explanation:

This is an example of arithmetic progression

We need to find 15 th term

Here

$a=200.5\\\\d=-3.5\\\\t_{15}=200.5+(15-1)\times-3.5\\\\=151.5$

3 0

2 years ago

Analyze Corey’s work to find his error. What is Corey’s mistake? He substituted 80 for x instead of y. He should have added 88.2

Anni [7]

x is the temperature and y is the number of swimmers. If there are 80 swimmers, then y = 80 instead of x = 80

This is how Corey should have solved

y = 1.505*x - 88.21

80 = 1.505*x - 88.21 <--- replace y with 80

1.505*x - 88.21 = 80

1.505*x = 80 + 88.21 <--- add 88.21 to both sides

1.505*x = 168.21

x = 168.21/1.505 <--- divide both sides by 1.505

x = 111.767

x = 111.8

If there are 80 swimmers at the pool, then the possible outside temperature is roughly 111.8 degrees F. This temperature seems awfully large, so it's possible that Corey's regression equation has limited scope; in other words, it isn't too useful if x is outside a given interval

<h2> IF YOU DONOT WANT TO READ SO MUCH THEN </h2>

PLEASE SEE THE ATTACHMENT 

4 0

3 years ago

One integer is 5 less than another and their product is 84. Find the integers.

andrezito [222]

The first integer is going to be x and the second one is going to be y.

We now turn the clues into equations:

x = y - 5

xy = 84

The substitution method:

(y - 5)y = 84

y^2 - 5y - 84 = 0

(y+7)(y-12) = 0

y = -7, 12.

If y = -7, then x = -12.

If y = 12, then x = 7

5 0

2 years ago

HELP PLZ 7k + 4s = 20 -8k + 2s = 10 What is the value of k?

Finger [1]

Divide 20 by 4=5
then 5 by 7=5/7

k=5/7

8 0

3 years ago