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4 years ago

Help me!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

Rudik [331]4 years ago

8 0

-2√20 - √125
(first make radical into simplest form - make sure to get similar radical)
√20 = 4√5
√125 = 5√5
(subtract the common radicals together)
-4√5 - 5√5 = -9√5

-9√5 is your answer

hope this helps

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Viktor [21]

I think it should be congruent figures

8 0

3 years ago

-20=-8z+12 what is z

AURORKA [14]

The answer to z would be 4

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6 0

3 years ago

Read 2 more answers

1. An outdoor art is a metal cube with edge length 39 feet. What is the volume of the cube in feet? In cubic yard? ( Can someone

Law Incorporation [45]

The volume of a cube is just the side length cubed...

V=s^3 in this case:

V=39^3=59319 ft^3

and in cubic yards it is:

59319 ft^3*(yd^3/27 ft^3)=2197 yd^3

5 0

3 years ago

luvenia can row 4mph in still water. She takes as long to row 7 mi upstream as 21 mi downstream. how

xeze [42]

Answer:

The speed of the river is 2mph.

Step-by-step explanation:

I guess that we want to find the speed of the river.

First, remember the relation: speed*time = distance

If the speed of the river is Sr, when Luvenia moves downstream (in the same direction that the flow of the water) the total speed will be equal to the speed of Luvenia in still water plus the speed of the water:

Sd = 4mph + Sr

and at this speed, in a time T, she can move 21 miles, so we have:

Sd*T = (4mph + Sr)*T = 21 mi

When moving upstream, the speed will be:

Su = (4mph - Sr)

and in the same time T as before, she moves 7 miles, so we have the equation:

Su*T = (4mph - Sr)*T = 7 mi

Then we have two equations:

(4mph + Sr)*T = 21 mi

(4mph - Sr)*T = 7 mi

Now we can take the quotient of those two equations and get:

((4mph + Sr)*T)/((4mph - Sr)*T) = 21/7

The time T vanishes, and we can solve it for Sr.

(4mph + Sr)/(4mph - Sr) = 3

4mph + Sr = 3*(4mph - Sr) = 12mph - 3*Sr

4*Sr = 12mph - 4mph = 8mph

Sr = 8mph/4 = 2mph.

7 0

4 years ago

The sum of the measures of the interior angles of a convex polygon is 1800 degrees? How many sides does the

AVprozaik [17]

Answer:

12 sides

Step-by-step explanation:

Given

Sum of interior angle = 1800 degrees

Required

Number of sides of the polygon

The sum of interior of a convex polygon is calculated using the following formula:

Sum = (n - 2) * 180

Where n is the number of sides of the polygon.

By substituting 1800 for Sum, we have

$1800 = (n - 2) * 180$

Divide through by 180

$\frac{1800}{180} = \frac{(n - 2) * 180}{180}$

$10 = n - 2$

Add 2 to both sides

$10 + 2 = n - 2 + 2$

$12 = n$

Re order

$n = 12$

Hence, the number of sides of the polygon is 12

6 0

3 years ago