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xeze [42]
3 years ago
8

Whats (4.2×10^6)+(2.25 × 10^5) in scientific form

Mathematics
1 answer:
lys-0071 [83]3 years ago
8 0
We are going to rewrite both numbers:
 (4.2 × 10 ^ 6) = 4200000
 (2.25 × 10 ^ 5) = 225000
 Adding we have:
 4200000 + 225000 = 4425000
 Rewriting in exponential notation we have:
 4425000 = 4,425 * 10 ^ 6
 Answer:
 
(4.2 × 10 ^ 6) + (2.25 × 10 ^ 5) is equal to:
 
4,425 * 10 ^ 6
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Bess [88]
You have a probability of 7% to pick out the first orange marble then you have a probability of 8% to pick out the second orange.
4 0
3 years ago
Heather finished the 12-kilometer race in 2 hours. If Heather kept her pace constant, what was her rate? A. 24 km/hr. B. 14 km/h
andriy [413]

Answer: D, 6km/hr.

Step-by-step explanation:

Heather can finish a 12-kilometer race in 2 hours, and now we have to find how many kilometers she can ride/run at in 1 hour.

How many hours can Heather run in 1 hour? To solve that, we can use the equation 12 ÷ 2.

12 ÷ 2 = 6.

Therefore, if Heather keeps her pace constant, then her rate will be 6km/hr, or D.

7 0
3 years ago
HELP PLS ITS URGENT
marysya [2.9K]

Melanie: 15 years old

Kevin: 5 years old

Assume Kevin's present age is x.

That means that 3 years ago, his age would be x - 3.

Melanie's age would be 6(x - 3).

Same thing for 5 years into the future:

Kevin's age would be x + 5.

Melanie's age would be 2(x + 5).

The two equations we have here are:

\left \{ {{x + 5 = 2(x + 5)} \atop {x - 3 = 6(x - 3)}} \right.

By subtracting both equations, we are simplified to:

8 = -4x + 28

By solving the equation, we get x = 5.

That means that Kevin's current age is 5 years old.

Melanie's age could be calculated by substituting Kevins'.

6(x - 3) --> 6(5 - 3) --> 12

Since that was 3 years ago, you need to add 3 to 12 to get her current age.

12 + 3 = 15

Melanie's current age is 15 years old.

3 0
2 years ago
Simplify this expression: 1/2(10x + 12) - (3.5x - 7) *
Anna71 [15]

Simplified Expression:

1.5x+13

7 0
3 years ago
plz help 20 pointssss!!!!!! The length of one edge of a cube is 3 units. What is the volume of this cube in units? A) 6 cubic un
marshall27 [118]

Answer:

See answer below

Step-by-step explanation:

Hi there,

The volume of a cube is the edge length cubed:

V = a³

The edge length given is 3 u, so plug into the formula:

V = (3 \ u)³ = 27 \ u³

thanks,

4 0
3 years ago
Read 2 more answers
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