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3 years ago

The radius of a circular lens of a magnifying glass is 4 centimeters. What is the area in square centimeters of the glass

1 answer:

7 0

You said that the radius is 4cm.

We can use the formula for the area of a circle: π x r²

So π x (4)²

is π x 16

= 16π

= 50.3 cm² (aprox).

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Niki wants to buy a dog bed the cost $87. She earns $6 per week for doing chores. How many weeks will Niki have to do her chores

Viktor [21]

Answer:

The answer to your question is 14.5 weeks

Step-by-step explanation:

Data

Total cost = C = $87

money earned = m = $6

Number of weeks to have the money = w = ?

Process

1.- Write an equation that represents the situation

Weeks = Total cost / Money earned

w = C/m

2.- Substitute the values

w = 87 / 6

3.- Result

w = 14.5

4.- Conclusion

Niki will last 14.5 weeks to have enough money to buy a dog bed.

7 0

3 years ago

1. On a 20 question test, Sarah got 2 questions wrong. What percent of the test does he have correct?

e-lub [12.9K]

Answer:

1=90%

Step-by-step explanation:

20-2=18, 18/20=90%

3 0

3 years ago

Read 2 more answers

Multiply (5 + 3i)(5 − 3i) 16 + 15i 16 − 15i 16 34

Annette [7]

Answer:

(5 + 3i)(5 − 3i) = 34

Step-by-step explanation:

The multiplication of two identical binomials who have different symbol, can be solved using the factoring case of a difference of squares:

$(a-b).(a+b)=a^{2}-b^{2}$

So, in this case:

$(5+3i).(5-3i) = 5^{2}-(3i)^{2}$

$=25-9i^{2}$

Remember that $i=\sqrt{-1}$

So: $i^{2}=-1$

We replace on the polynomial:

$=25-9.(-1) = 25+9=34$

3 0

3 years ago

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I'm struggling right now because I learned this but I completely forgot how to do it. I need to find the distance between two po

DochEvi [55]

Answer:

12 units

Step-by-step explanation:

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3 years ago

Why is the point of intersection for a system of equations considered its solution?

meriva

Answer:

because they never touch

8 0

3 years ago

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