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3 years ago

Find the Area of a square with length(x + 7) and width (x + 7)

Mathematics

1 answer:

ValentinkaMS [17]3 years ago

8 0

Answer:

x^2 +14x+49

Step-by-step explanation:

Area = length * width

= ( x+7) * ( x+7)

FOIL

first: x^2

outer: 7x

inner: 7x

last: 7*7 = 49

Add them together

x^2 +7x+7x + 49

Combine like terms

x^2 +14x+49

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-BARSIC- [3]

8+2x

That will be the answer.

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4 years ago

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Harmonic mean if a number h such that (h-a)/(b-h)=a/b Prove h is H(a,b) iff satisfies either relation a. (1/a)-(1/h) = (1/h) - (

Fudgin [204]

A.

$\displaystyle\frac1a-\frac1h=\frac1h-\frac1b$
$\implies\displaystyle\frac{h-a}{ah}=\frac{b-h}{bh}$
$\implies\displaystyle\frac{h-a}{b-h}=\frac{ah}{bh}$
$\implies\displaystyle\frac{h-a}{b-h}=\frac ab$

b.

$\displaystyle h=\frac{2ab}{a+b}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{\frac{2ab}{a+b}-a}{b-\frac{2ab}{a+b}}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{2ab-a(a+b)}{b(a+b)-2ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{ab-a^2}{b^2-ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{a(b-a)}{b(b-a)}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac ab$

The other direction can be proved by following the manipulations in the reverse order.

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3 years ago

Junnie walked for 2.5 hours at a speed of 3.miles per hour. How far did Junnie walk?

Leona [35]

Answer:

7.5 miles

Step-by-step explanation:

2.5 times 3

hope this can help you :-P

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4 years ago

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Goshia [24]

Answer:

75°

Step-by-step explanation:

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All we need to do is simply subtract 15° from 90° to find m∠ATB:

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maks197457 [2]

Answer:

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3 years ago