3 years ago

What is the surface area of the solid that this net can form?

Mathematics

1 answer:

allochka39001 [22]3 years ago

5 0

Answer:

Option B

Step-by-step explanation:

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if Donnie has 100 marbles and gives 25 away to Arthur and 35 to mike how many marbles does Donne have?

Marat540 [252]

Answer:

Step-by-step explanation:

100 MINUS 25 PLUS 35

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3 years ago

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Use the formula you just learned to help you complete the following. A circle’s diameter is approximately 14 cm.

damaskus [11]

Answer:

A= 7

B= 154

Step-by-step explanation:

A: the radius is half of the diameter

B: pie*radius to the second power

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3 years ago

Last year, James earned £1,300 per month.

mrs_skeptik [129]

Answer:

1300/100 X 105 = 1365

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341.25/40= 8.53125

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3 years ago

Find the rate of $740 for 5 pounds

Lady_Fox [76]

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Step-by-step explanation:

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3 years ago

Prove that root 7 is irrational by the method of contradiction

Alchen [17]

Let assume that $\sqrt7$ is a rational number. Therefore it can be expressed as a fraction $\dfrac{a}{b}$ where $a,b\in\mathbb{Z}$ and $\text{gcd}(a,b)=1$ .

$\sqrt7=\dfrac{a}{b}\\\\7=\dfrac{a^2}{b^2}\\\\a^2=7b^2$

This means that $a^2$ is divisible by 7, and therefore also $a$ is divisible by 7.

So, $a=7k$ where $k\in\mathbb{Z}$

$(7k)^2=7b^2\\\\49k^2=7b^2\\\\7k^2=b^2$

Analogically to $a^2=7b^2$ ------- $b^2$ is divisible by 7 and therefore so is $b$ .

But if both numbers $a$ and $b$ are divisible by 7, then $\text{gcd}(a,b)=7$ which contradicts our earlier assumption that $\text{gcd}(a,b)=1$ .

Therefore $\sqrt7$ is an irrational number.

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4 years ago