2 years ago

Someone help me please

Mathematics

1 answer:

Bond [772]2 years ago

6 0

Answer:

Step-by-step explanation:

Plug in the standard deviation formula. This is new to me but it took some research.. Hope it helps

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THIS IS TIMES I ONLY HAVE 5 MINUTES LEFT PLEASE SOMEONE HELP!!

Delvig [45]

Answer:

A. 10+10+5x=80 or 20+5x=80

B. Disagree, After the pay for each person to get in the have 60 dollars left. Each ride costs 5 dollars. 60 divided by 5=12 and each of them would need a ticket, so they could only ride 6 rides/

C. 20/5=4=they could by an additional 4 tickets, each would need a ticket so they could ride 2 more rides each

Step-by-step explanation:

80-20=60

60/5=12

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2 years ago

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In a nursery class of 18 pupils, the average is

melamori03 [73]

Answer:

The sum of the age of pupils is 81

Step-by-step explanation:

Let sum of age of 18pupils = x

Average ages = 4.5

Average = total/no. of pupil

4.5 = x/18

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yanalaym [24]

X=2y-2

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3 years ago

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solve systems of equation. equation number 1: 9 x squared + 4 y squared equals 144. equation 2: x squared plus y squared equals

grigory [225]

$9x^{2} + 4y^{2} =144$
$x^{2} + y^{2}=24$

$9x^{2} + 4y^{2} =144$
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by the difference
5 $x^{2}$ =48
so x= $\sqrt{\frac{48}{5}}$ or x=- $\sqrt{\frac{48}{5}}$
and $y^{2}$ =24- $\frac{48}{5}$
then y= $\sqrt{\frac{72}{5}}$ or - $\sqrt{\frac{48}{5}}$

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3 years ago

It's students so raffle tickets to raise money for a field trip the first 20 tickets sold four dollars each to sell more tickets

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