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3 years ago

5(4x-1)-2x=31 what does x equal

Mathematics

2 answers:

Elenna [48]3 years ago

6 0

Answer:

X=2

Step-by-step explanation:

5(4x-1)-2x=31

Distribute the 5

20x-5-2x=31

18x-5=31

18x=31+5

18x=36

When you divide you get 2

Also, Photomath exists, it’s great for math problems

ehidna [41]3 years ago

3 0

20x - 5 - 2x = 31

18x = 36

x = 2

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Which of the following is equal C(10,3)?<br><br> a. C(3,10)<br><br> b. C(10,7)<br><br> c. P(10,3)

agasfer [191]

Answer:

Option: b is correct.

b. C(10,7)

Step-by-step explanation:

The formula for C(n,k) is evaluated as:

$C(n,k)=\dfrac{n!}{k!\times (n-k)!}$

Also The formula for P(n,k) is evaluated as:

$C(n,k)=\dfrac{n!}{(n-k)!}$

$C(10,3)=\dfrac{10!}{3!\times (10-3)!}\\\\C(10,3)=\dfrac{10!}{3\times 7!}\\\\C(10,3)=120$

$C(3,10)=\dfrac{3!}{10!\times (3-10)!}\\\\C(3,10)=\dfrac{3!}{10!\times (-7)!}$

and e know the factorial of negative number does not exist.

so, this is not possible.

Hence, option a is incorrect.

C(10,7)

$C(10,7)=\dfrac{10!}{7!\times (10-7)!}\\\\C(10,7)=\dfrac{10!}{7!\times 3!}\\\\C(10,7)=120$

Hence, option b is correct.

P(10,3)

$P(10,3)=\dfrac{10!}{(10-3)!}\\\\P(10,3)=\dfrac{10!}{7!}\\\\P(10,3)=720$

Hence, option c is incorrect.

Hence, C(10,7) is equal to C(10,3).

Hence, option b is correct.

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3 years ago

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Use the rules for multiplication by powers of 10 to calculate 20 × 100.

motikmotik

$\huge{\text{Hey there!}}$

$\text{Question yourself}\bf{\ How\ many\ times\ does\ 20\ goes\ into\ 100?}$

$\huge{\text{20\ *\ 100 = ?}}$

$\text{If you remember the steps onto how to solve\bf{\ long\ multiplication}}$ $\text{then, you should know how to solve this equation just with more steps!}$

$\huge\boxed{\boxed{\text{Answer: A. 2,000}}}\huge\checkmark$

$\text{Good luck on your assignment and enjoy your day!}$

~ $\huge\frak{LoveYourselfFirst:)}$

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An instructor asked her students how much time (to the nearest hour) they spent studying for the midterm. The data are displayed

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Based on the data displayed in the histogram, the percentage of students who study 2 or more hours for the midterm is 88%.

<h3>What percentage study 2 hours or more?</h3>

First, find the number of students studying:

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The number of students studying 2 or more hours for the exam are:

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