I need help on 13 and 15 that all

Mathematics

1 answer:

mihalych1998 [28]3 years ago

8 0

<span>Anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. What is this number expressed in scientific notation?</span>

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URGENT!!!!!!!!!!!!!!!!

Kruka [31]

Answer:

0.5 over 1

Step-by-step explanation:

look at how much it goes down

8 0

2 years ago

In a wooded area, you randomly select 10 trees and find that 3 are tagged. You conclude that there is a 30% probability of rando

Drupady [299]

It's Empirical, I believe.

4 0

3 years ago

Read 2 more answers

The diagram shows a cuboid<br> What is the surface area of the cuboid?<br> 4cm,5cm and 9cm

AveGali [126]

Answer:

surface area of a cuboid=2(L*W)+ 2(L*H)+ 2(W*H)

2(9*5)+2(9*4)+2(5*4)

$2 \times 45 + 2 \times 36 + 2 \times 20$

$90 + 72 + 40 = 202 {cm}^{2}$

8 0

2 years ago

Question 4 (20 points)

Pepsi [2]

16 there is the answer glad to help

4 0

2 years ago

one canned juice drink is 25% orange juice ; another is 10% orange juice. how many liters of each should be mixed towing order t

JulijaS [17]

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Assumptions
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Let x be the amount of 25% orange juice
Let y be the amount of 10% orange juice

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There are 15 litres of 13% orange juice
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x + y = 15

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The 15 litres of juice is 13% orange juice
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0.25x + 0.1y = 15 x 0.13
0.25x + 0.1y = 1.95

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Rewrite the equations and solve for x and y
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x + y = 15 ----------------------- (Equation 1)
0.25x + 0.1y = 1.95 ----------- (Equation 2)

(Equation 1):
x + y = 15
x = 15 - y ----------- (Substitute into Equation 2)

0.25 (15 - y) + 0.1y = 1.95
3.75 - 0.25y + 0.1y = 1.95
0.15y = 1.8
y = 18 ÷ 0.15
y = 12 ------------- (substitute into Equation 1)

x + y = 15
x + 12 = 15
x = 15 - 12
x = 3

x = 3 and y = 12

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Answer: 3 liters of 25% of orange juice with 12 liters of 10% orange juice
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7 0

3 years ago