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3 years ago

The height of an equilateral triangle is 13 feet. The triangles area is 39 feet squared. What is the perimeter of the triangle?

Mathematics

1 answer:

cluponka [151]3 years ago

8 0

Answer:

It is 6ft

Step-by-step explanation:

The formula is

A= 1/2bh so now you would substitute

39= 1/2(13)h

78= 13h

6=h

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balandron [24]

Answer:

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Step-by-step explanation:

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2 years ago

A researcher surveyed 220 residents of a city about the number of hours they

olga55 [171]

Answer:

Margin of error of 0.0485 hours.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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$\sigma = 0.35, n = 220$

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Margin of error of 0.0485 hours.

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2 years ago

On a coordinate plane, solid circles appear at the following points: (negative 3, 2), (negative 3, 3), (1, 4), (1, negative 4),

hammer [34]

Answer:

3 points

Step-by-step explanation:

A function is a relation that maps elements of a set for the inputs (the domain, usually denoted with the variable x) into elements of another set, the set of the outputs (the range, usually denoted with the variable y).

So the relation can be represented with points (x, y), which means that point x is being mapped into point y.

Such that the needed condition is that each element of the domain is mapped into only one element in the domain.

So for example, if for a relationship we have the points (a, b) and (a, c)

The point a is being mapped into two different outputs.

Now let's go to our problem, we have the points:

(-3, 2), (-3, 3), (1, 4), (1, -4), (2, -4), (2, -2)

If we have repeated inputs, we need to remove points until we have one of each.

We can see that the inputs -3, 1, and 2 are repeated one time.

Then we need to remove one of each, for example if we remove the second, fourth and sixth points, the set becomes:

(-3, 2), (1, 4), and (2, -4)

This is a function.

Then we need to remove 3 points.

7 0

2 years ago

Read 2 more answers

A ball bearing is fired straight up at a speed of 40m/s. Calculate the time during which it is in the air. Ignore air resistance

ololo11 [35]

Answer:

t = 8.2 sec

Step-by-step explanation:

the ball will move with uniform deceleration due to gravity until it reaches the highest point at which v = 0 then will change its direction and continue with uniform acceleration until it hits the ground.

the time the ball takes to reach the highest point equals the time it takes to return to the ground again.

to calculate the total time, we calculate the first half then multiply it by 2

we use the first equation because we have all the variables except time

v = 0 , u = 40 , a = -9.8

0 = 40 - 9.8t

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total time = 4.1 x 2 = 8.2 sec

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3 years ago

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cupoosta [38]

Answer: