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3 years ago

When doing simple math, what does the term PEMDAS mean?

Mathematics

2 answers:

USPshnik [31]3 years ago

8 0

Answer:

p- perentathis ( )

E- exponints

M- Multiplication

D- divishion

A-addition

s- subtraction

( sorry about my spelling)

Klio2033 [76]3 years ago

7 0

Please-parentheses --------- (_)

Excuse-exponent-------------- ^2

My-multiply ---------------------- X

Dear-divide ---------------------- /

Aunt-addition ------------------- +

Sally-subtraction --------------- -

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Answer:

Step-by-step explanation:

The value of y varies directly with x. When y = 75, x = ½ . What is the value of y when x is 2 ¼ ? A. 168.75 C. 66.67 B. 16.67 D. 337.5

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2 years ago

Bashir works in a weather station and has launched a weather ballon. The height of the baloon is 4 kilometers and it is 1 kilome

andrew-mc [135]

Answer:

Explanation:

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Setting up the diagram that describes the given scenario, we would end up with a right-angled triangle as the one shown in the attached image

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height of the balloon = 4 km represents one side of the triangle

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2 years ago

when a stone falls freely, the time taken to hit the ground varies as the square root of the distance fallen. If it takes four s

Eva8 [605]

Answer:

The stone would take approximately 10.107 seconds to fall 500 meters.

Step-by-step explanation:

According to the statement of the problem, the following relationship of direct proportionality is built:

$t \propto y^{1/2}$

$t = k\cdot t^{1/2}$

Where:

$t$ - Time spent by the stone, measured in seconds.

$y$ - Height change experimented by the stone, measured in meters.

$k$ - Proportionality constant, measured in $\frac{s}{m^{1/2}}$ .

First, the proportionality constant is determined by clearing the respective variable and replacing all known variables:

$k = \frac{t}{y^{1/2}}$

If $t = 4\,s$ and $y=78.4\,m$ , then:

$k = \frac{4\,s}{(78.4\,m)^{1/2}}$

$k \approx 0.452\,\frac{s}{m^{1/2}}$

Then, the expression is $t = 0.452\cdot y^{1/2}$ . Finally, if $y = 500\,m$ , then the time is:

$t = 0.452\cdot (500\,m)^{1/2}$

$t \approx 10.107\,s$

The stone would take approximately 10.107 seconds to fall 500 meters.

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2 years ago