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3 years ago

What is 3x+5x+2 factorised for yr 10 gcse

Mathematics

1 answer:

marusya05 [52]3 years ago

5 0

Factorising quadratic expressions

Multiply these brackets to remind yourself how to factorise.

( x + 2 ) ( x + 5 ) = x2 + 7x + 10( x + 2 ) ( x + 3 ) = x2 + 5x + 6( x - 3 ) ( x - 5 ) = x 2 - 8x + 15( x + 6 ) ( x - 5 ) = x2 + x - 30( x - 6 ) ( x + 5 ) = x2 - x - 30

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It is predicted that by 2050 there will be 10^10 people living on earth. approximatrly will be 10^12 trees. how many trees for e

Nastasia [14]

Interesting question. Does that mean near the end of humanity?

Solution 1:

10^10 = 1,000,000,000

10^12 = 100,000,000,000

100,000,000,000/1,000,000,000 = 100 trees per person

Solution 2:

10^12 / 10^10 --- 10^10 / 10^10

10^2/1 = 10^2 = 100 trees per person

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3 years ago

A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes. Supp

riadik2000 [5.3K]

Answer:

$H_0:\mu =45\\\\H_a:\mu\geq 45$

Step-by-step explanation:

Since we have given that

A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes.

Since we need to carry out a hypothesis test whether he can refute the claim.

We always take the alternate hypothesis such that it should satisfy the given statement.

And the null hypothesis can be equal to mean or other than that is given in alternate hypothesis.

So, hypothesis :

$H_0:\mu =45\\\\H_a:\mu\geq 45$

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3 years ago

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elena-14-01-66 [18.8K]

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3 years ago

If a parallelogram has diagonals that are perpendicular bisectors of each other, what is the most descriptive name for it?

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3 years ago

What does 1 1/16-3/8 equal?

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Answer:

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2 years ago