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3 years ago

Can somebody help me with these two pls

Mathematics

1 answer:

lana [24]3 years ago

5 0

Answer:

Step-by-step explanation:

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The Boardman family walked two over five of a mile in two over seven of an hour. What is their unit rate in miles per hour?

hichkok12 [17]

If the family walked 2/5 of a mile in 2/7 of an hour their MPH would be 2.8mph

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3 years ago

A bank pays $15 in interest for every $100 deposited.<br> The bank pays how much interest?

Veronika [31]

Answer:

15% interest

Step-by-step explanation:

because it's 15 out of 100 so that would be 15%

8 0

3 years ago

Choose the correct simplification of x to the 12th power times z to the 11th power all over x to the 2nd power times z to the 4t

Umnica [9.8K]

Answer:

<h3>The option A) $x^{10}z^7$ is correct answer.</h3><h3>The correct simplification for the given expression $\frac{x^{12}\times z^{11}}{x^2\times z^4}$ is $x^{10}z^7$ </h3>

Step-by-step explanation:

Given expression is x to the 12th power times z to the 11th power all over x to the 2nd power times z to the 4th power.

The given expression can be written as $\frac{x^{12}\times z^{11}}{x^2\times z^4}$

<h3>To choose the correct simplification of the given expression :</h3>

Now we have to simplify the given expression as below

$\frac{x^{12}\times z^{11}}{x^2\times z^4}$

$=x^{12}\times z^{11}(x^{-2}\times z^{-4})$ ( by using the identity $\frac{1}{a^m}=a^{-m}$ )

$=(x^{12}.x^{-2})\times (z^{11}.z^{-4})$

$=x^{12-2}\times z^{11-4}$ ( by using the identity $a^m.a^n=a^{m+n}$ )

$=x^{10}\times z^7$

$=x^{10}z^7$

∴ $\frac{x^{12}\times z^{11}}{x^2\times z^4}=x^{10}z^7$

<h3>The correct simplification for the given expression $\frac{x^{12}\times z^{11}}{x^2\times z^4}$ is $x^{10}z^7$ </h3><h3>Hence option A) $x^{10}z^7$ is correct answer.</h3>

4 0

4 years ago

Heidi buys shirts for $20 and resells for $24. What is the percentage of Heidi's markup? Plz help me!!

Vadim26 [7]

20% because 4 dollars is 1/5 of 20

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4 years ago

Evaluate each expression a3 for a=5

nadezda [96]

I'm assuming you meant to say a^3. If so, then

a^3 = a*a*a
a^3 = 5*5*5
a^3 = 125

4 0

4 years ago