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3 years ago

Explain how using basic facts can help you find 10x20x30x40 mentally

Mathematics

2 answers:

murzikaleks [220]3 years ago

6 0

Answer:

first multiply 1 times 2 which is easy 2, then 2 times 3 which is 6, then 6 times 4

After add up the zeros and there are 4 zeros so the answer is

40000

Step-by-step explanation:

Bess [88]3 years ago

6 0

Answer:

multiply the first number 1*2*3*4 then add the zeros

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3 years ago

1. Solve 2(x + 1)^2 = 18. What are the x-intercepts?

ddd [48]

Answer:

The x-intercepts are $(2,0)$ and $(-4,0)$ .

Step-by-step explanation:

We are given the equation

$2(x+1)^2=18$

Begin by dividing both sides of the equation by 2:

$(x+1)^2=9$

Next, take the square root of both sides. Remember that there are two solutions to a square root, the positive and the negative root:

$x+1=\pm3$

Split the equation into two based on the two solutions:

$x+1=-3$

$x+1=3$

Solve each equation by subtracting 1 from both sides:

$x=-4\\ x=2$

Since the x-intercepts are the solutions to a quadratic, we know the solutions are (2,0) and (-4,0).

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3 years ago

100 points+Brainliest for correct answer

goblinko [34]

Answer:

The electron moved down to an energy level and has an energy of

$10.92 \times 10^{-19} \textsf{J}$

Step-by-step explanation:

$\textsf{initial energy level of electron}= 16.32 \times 10^{-19} \textsf{J}$

$\triangle E =\textsf{energy released}= 5.4 \times 10^{-19} \textsf{J}$

A positive energy change means that the electron absorbs energy, while a negative energy change implies a release of energy from the electron.

Therefore, when an electron absorbs energy, the electron moves up to higher energy levels, and when an electron releases energy, it moves to lower energy levels.

$\triangle E=E_2-E_1$

$\implies 5.4 \times 10^{-19} = 16.32 \times 10^{-19} -E_1$

$\implies E_1= 16.32 \times 10^{-19} -5.4 \times 10^{-19}$

$\implies E_1= 10.92 \times 10^{-19}$

<u>Answer</u>:

The electron moved down to an energy level and has an energy of

$10.92 \times 10^{-19} \textsf{J}$

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2 years ago