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NARA [144]
3 years ago
10

REUPLOAD PLS HELP AND SUPER FAST !! YES BRAINLEST :))

Mathematics
1 answer:
eimsori [14]3 years ago
3 0
30/150 = 80/x

Reduce the fraction:
1/5 = 80/x

Cross multiply:
x = 5 x 80

x= 400

Answer: 400 zebras.
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How do you do series with an n
SOVA2 [1]
The problem can be solved step by step, if we know certain basic rules of summation.  Following rules assume summation limits are identical.
\sum{a+b}=\sum{a}+\sum{b}
\sum{kx}=k\sum{x}
\sum_{r=1}^n{1}=n
\sum_{r=1}^n{r}=n(n+1)/2

Armed with the above rules, we can split up the summation into simple terms:
\sum_{r=1}^n{40r-21n+8}=n
=40\sum_{r=1}^n{r}-21n\sum_{r=1}^n{1}+8\sum_{r=1}^n{1}
=40\frac{n(n+1)}{2}-21n^2+8n
=20n(n+1)-21n^2+8n
=28n-n^2

=> (a) f(x)=28n-n^2
=> f'(x)=28-2n 
=> at f'(x)=0 => x=14
Since f''(x)=-2 <0  therefore f(14) is a maximum
(b) f(x) is a maximum when n=14

(c) the maximum value of f(x) is f(14)=196
4 0
2 years ago
 Help me pleaseee!!<br> Would appreciate ^^<br> **BRAINLIST, thanks and points***<br> Fasstt pls
sveticcg [70]

Answer:

2500000000

Step-by-step explanation:

→ Multiply 1 by 25000

1 × 25000 = 25000

→ Convert into metres

2500000

→ Convert into centimetres

2500000000

7 0
2 years ago
Read 2 more answers
Question 1 of 10
ollegr [7]

Answer:

B  &  C

Step-by-step explanation:

  √16 / √100

=  4  /  10

=  2 / 5

7 0
1 year ago
Which is the correct solution to ‐3x&lt;21?
elena-s [515]
Top right
this is because, when dividing an inequality by a negative number, you must flip the inequality sign

-3x < 21
x > -7
8 0
2 years ago
Read 2 more answers
HELP PLEASE!!!!!!!! I GIVE 21 POINTS!!!!!!!!! AND BRAINLEAST &lt;3
REY [17]

6. domain=age

range= number of pets

it is not a function because an x value repeats


7. domain=1,2,3,4,5

range= 50, 100, 150, 150, 200

it is a function because the lines don't connect

7 0
3 years ago
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