3 years ago

Use benchmarks to estimate 6.34 + 3.95

Mathematics

2 answers:

larisa86 [58]3 years ago

8 0

6.34 rounds to 6.
3.95 rounds to 4.
So 6+4=10

alexandr1967 [171]3 years ago

8 0

10.30 is the correct answer.

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elena55 [62]

Answer:

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3 years ago

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<img src="https://tex.z-dn.net/?f=4x%20%7B%7D%5E%7B2%7D%20%20%2B%2020x%20%2B%2025" id="TexFormula1" title="4x {}^{2} + 20x + 25

BigorU [14]

$\sf{\qquad\qquad\huge\underline{{\sf Answer}}}$

Let's Solve ~

$\qquad \sf \dashrightarrow \: 4 {x}^{2} + 20x + 25$

$\qquad \sf \dashrightarrow \: 4 {x}^{2} + 10x + 10x + 25$

$\qquad \sf \dashrightarrow \: 2x(2x + 5) + 5(2x + 5)$

$\qquad \sf \dashrightarrow \: (2x + 5) (2x + 5)$

$\qquad \sf \dashrightarrow \: (2x + 5) {}^{2}$

$\sf{\qquad \sf \dashrightarrow \: 4x² + 20x + 25 }$

$\sf{\qquad \sf \dashrightarrow \: (2x)² + (2 \sdot 2x \sdot 5) + (5)²}$

[ it's similar to expression - a² + 2ab + b² that is equal to (a + b)² ]

so, let's use this identity here to factorise :

$\sf{\qquad \sf \dashrightarrow \: (2x + 5)²}$

I hope it was helpful ~

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2 years ago

Evaluate log38, given log32 ≈ 0.631.

ArbitrLikvidat [17]

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3 years ago

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Novay_Z [31]

Answer:

1/1024

Step-by-step explanation:

1/(4*4*4*4*4)

1/1024

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Step-by-step explanation:

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