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artcher [175]
3 years ago
10

Simplify the expression: 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 . A. 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 B. 2√ 5 + 9√ 7 C. 2√ 20 − 4√ 7 − 2√ 5 D. 2

√ 20 − 3√ 7 + 4√ 63
Mathematics
2 answers:
noname [10]3 years ago
8 0
2 \sqrt{20}- 3\sqrt{7}-2 \sqrt{5}+4 \sqrt{63}=2 \sqrt{4*5}- 3\sqrt{7}-2 \sqrt{5}+4 \sqrt{9*7}= \\ \\ 2 *2\sqrt{5}- 3\sqrt{7}-2 \sqrt{5}+4*3 \sqrt{7}=4\sqrt{5}- 3\sqrt{7}-2 \sqrt{5}+12 \sqrt{7}= \\ \\ =2 \sqrt{5}+9 \sqrt{7}

Answer: <span>B. 2√5 + 9√7 </span>
ipn [44]3 years ago
7 0
B is the right option. hope it helps
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Surveys indicate that two-thirds of all voters in Ward 5 plan on choosing Spike Jones for commissioner. If there are 500 voters
olya-2409 [2.1K]

<u>Answer:</u>

333 people of ward 5 are going to be voting for Spike Jones.

<u>Solution:</u>

We have been given that two-thirds of all voters in Ward 5 plan on choosing Spike Jones for commissioner.  

There are 500 voters in Ward 5.

Since 2/3 of all voters in Ward 5 are voting for Spike Jones the remaining 1/3 will not be voting for him.

To find out how many people in ward 5 are exactly voting for Spike Jones. We need to calculate how much is two thirds of 500 is.

This is done as follows:

\begin{array}{l}{\frac{2}{3} \times 500} \\\\ {=\frac{1000}{3}} \\\\ {=333.334}\end{array}

Since people cannot be denoted in decimal points we have to round it off to a whole number. That’s is 333.

Therefore 333 people of ward 5 are going to be voting for Spike Jones.

4 0
3 years ago
You are dealt one card from a​ 52-card deck. find the probability that you are not dealt a two
Rina8888 [55]

There are 52 cards in a deck.

First we find the probability of drawing a 2

There are 4 cards that shows 2

Probability of drawing a 2 card fro 52 cards = 4 / 52

We know that P( not A) = 1 - P(A)

So the probability (not dealt a 2) = 1 - probability (dealt a 2)

= 1 - 4/52

= (52 - 4)/ 52 = 48/52

Now we simplify the fraction

48/ 52 = 12/13

Hence, the probability( not dealt a 2) = 12/13

7 0
3 years ago
Write a slope intercept equation for a line that passes through (4,0) and (-2,2)
LenaWriter [7]

The y-intercept = 4

y =  _x + 4

The change is 6,2 or 1/3x!

<h2>y = 1/3x + 4</h2>
8 0
3 years ago
I need to know the steps of how they got 1 over 2
lbvjy [14]

the simplified so 9 and 18 can both be divided by 9 so 9/18 dived by 9/9 would be 1/2 you can also but 9 divided by 18 in a calculator


3 0
3 years ago
Company A has no initial fee but charges 80 cents for every mile driven.
Tamiku [17]

Answer:

m > 550

Step-by-step explanation:

0.80m > 55+0.70m

0.10m > 55

m > 55/0.10 = 550

A costs more when you drive more than 550 miles.

3 0
3 years ago
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