3 years ago

The table shows the approximate diameters of four bacteria cells.

Mathematics

1 answer:

PIT_PIT [208]3 years ago

8 0

Answer:

Step-by-step explanation:

It’s b I think

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Which of the following is a perfect square trinomial?

shutvik [7]

Answer:

Step-by-step explanation:

Take a look at what happens when squaring either of these...

$(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\$

Notice a couple of patterns.

1. The last term has a positive coefficient. That rules out answer choices C and D.

2. The coefficient of the middle term is either $+2ab \text{ or } -2ab$ . So what are a and b? a is the square root of the x^2 term and b is the square root of the y^2 term.

$25x^2 \Rightarrow a=5\\\\9y^2 \Rightarrow b=3\\\\ab=15\\\\2ab=30$

The middle coefficient needs to be either +30 or -30. The answer is choice A.

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2 years ago

The area of the trapezium is 63cm and the top is 6cm and the bottom is 12cm what’s the height

steposvetlana [31]

Answer:

height = 7 cm

Step-by-step explanation:

The area (A) of a trapezium is calculated using the formula

A = $\frac{1}{2}$ h(a + b)

where h is the height and a, b the parallel bases

here a = 6, b = 12 and A = 63, hence

$\frac{1}{2}$ × h × (6 + 12) = 63

$\frac{1}{2}$ h × 18 = 63

9h = 63 ( divide both sides by 9 )

h = 7

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3 years ago

Find the difference between the place values of two nines in 79520986

Evgen [1.6K]

Answer:

Step-by-step explanation:

9000000 - 900 = 8999100

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3 years ago

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Find the solutions to the equation below.

yanalaym [24]

Answer:

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Step-by-step explanation:

6x2+5X-4=0

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X=1/2. X=4/3

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3 years ago

A construction worker needs to put a rectangular window in the side of a building. He knows from measuring that the top and bott

Alexxandr [17]

Answer: 15 feet

Step-by-step explanation:

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