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3 years ago

Which expression shows how to convert 60 hours to days?

Mathematics

2 answers:

MAVERICK [17]3 years ago

7 0

Answer:

2.5 days

Step-by-step explanation:

almond37 [142]3 years ago

3 0

Answer:

2.5 Days

Step-by-step explanation:

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2. Circle C, has center (0,0) and radius 2.

adell [148]

Answer:

2. x ² + y ² = 4

3. x² + y² = 23

Step-by-step explanation:

The equation of a circle with center

( a , b ) and radius r is:

( x − a )² + ( y − b ) ² = r ²

Explanation:

Here,

a = 0 , b = 0 , r = 2

The equation is:

( x -0 ) ² + ( y -0 ) ² = ( 2 ) ²

that is: x ² + y ² = 4

Thus:

x ² + y ² = 4

3. Each point on a circle has the same distance from the center. This distance is the radius r of the circle.

Here, ( -3 , 4 ) is a point on the circle, meaning that the radius of the circle is the distance between ( 0 , 0 ) , the center, and ( -3 , 4 ) .

thus a circle centered on the origin will have an equation of:

x² + y² =r²

And, ( -3 , 4 ) lies on the circle, we have:

(-3)² + (4)² = r²

9 + 14 = 23

substituting;

x² + y² = 23

8 0

2 years ago

Classify this triangle by the angles and lengths of sides shown.

alekssr [168]

The answer is A right, scalene

8 0

2 years ago

Read 2 more answers

The brand manager for a brand toothpaste must plan a campaign designed to increase brand recognition. He wants to first determin

bulgar [2K]

We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.

From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, $Z_{Critical}=1.645$ .

We also know that E=5% or E=0.05

Also, since, $\hat{p}$ is not given, we will assume that $\hat{p}$ =0.5. This is because, the formula that we use will have $\hat{p}(1-\hat{p})$ in the expression and that will be maximum only when $\hat{p}$ =0.5. (For any other value of $\hat{p}$ , we will get a value less than 0.25. For example if, $\hat{p}$ is 0.4, then $1-\hat{p}=0.6$ and thus, $\hat{p}(1-\hat{p})=0.24$ .).