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raketka [301]
3 years ago
15

Please help. You dont have to show work.

Mathematics
1 answer:
g100num [7]3 years ago
8 0
%error=100(estimate-actual)/actual

%e=100(50-40)/40=25%

can't see the whole question but...

40(60/100)=24

so 24/40=3/5 carry a phone.

24 students carry a phone.
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A regular octagon with side length a cm can be made by cutting off
Ksivusya [100]

Answer:

one side = \frac{a\sqrt{2}}{2}

Step-by-step explanation:

if you draw an octagon on a piece of paper, you can draw a square around it, you should be able to see a diagram of this attached, ignore the 6.

Let's say TP = a

since it's a regular octagon, TP = HT

and using the Pythagoras Theorem,  we know a² + b² = c² and thus:

√(AT² + HA²) = HT

and since AT = HA which we will call x, the equation becomes:

√(2x²) = HT = a

rearrange the equation to solve for x and you get:

2x² = a²

x² = \frac{a^{2} }{2}

x = \frac{a}{\sqrt{2}}

which, if you rationalise the denominator, you get:

x = \frac{a\sqrt{2}}{2}

5 0
3 years ago
Two different families pay for entry into a water park.
icang [17]

Answer:

Adult ticket: $7

Child ticket: $2

Step-by-step explanation:

Set up a system of equations where a represents the cost of one adult ticket and c is the cost of one child ticket:

2a + 3c = 20

a + 4c = 15

Solve by elimination by multiplying the bottom equation by -2:

2a + 3c = 20

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Add them together:

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c = 2

Now, we can plug in 2 as c to find the value of a:

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2a + 3(2) = 20

2a + 6 = 20

2a = 14

a = 7

6 0
3 years ago
Help me with this please
liraira [26]

Answer:

B

Step-by-step explanation:

the data value of x is 0 the the value would be .75 times that by 2 get 1.25

8 0
2 years ago
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Nady [450]

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2 years ago
A shirt is on sale for $30. It was originally $40 What is the percent of the decrease?​
SpyIntel [72]

Answer:

25% percent

Step-by-step explanation:

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3 years ago
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