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3 years ago

15

Someone PLEASE help me!!!!!!!!!!!! Leonard used 2/7 of his paycheck to pay his cell phone bill. How much was Leonard's cell phon

e bill?

1 answer:

Sphinxa [80]3 years ago

8 0

Is there any answer choices to this question?

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10. Which of the following statements are TRUE?

Masja [62]

Answer:

A, C, D

Step-by-step explanation:

1) A triangular pyramid has the same number of faces as vertices: 5

2) C - The sum is 5 + 6 =11

3) D - Euler's Formula tells us that if we add the number of faces and vertices together and then subtract the number of edges, we will get 2 as our answer.

4 0

3 years ago

Can somebody prove this mathmatical induction?

Flauer [41]

Answer:

See explanation

Step-by-step explanation:

1 step:

n=1, then

$\sum \limits_{j=1}^1 2^j=2^1=2\\ \\2(2^1-1)=2(2-1)=2\cdot 1=2$

So, for j=1 this statement is true

2 step:

Assume that for n=k the following statement is true

$\sum \limits_{j=1}^k2^j=2(2^k-1)$

3 step:

Check for n=k+1 whether the statement

$\sum \limits_{j=1}^{k+1}2^j=2(2^{k+1}-1)$

is true.

Start with the left side:

$\sum \limits _{j=1}^{k+1}2^j=\sum \limits _{j=1}^k2^j+2^{k+1}\ \ (\ast)$

According to the 2nd step,

$\sum \limits_{j=1}^k2^j=2(2^k-1)$

Substitute it into the $\ast$

$\sum \limits _{j=1}^{k+1}2^j=\sum \limits _{j=1}^k2^j+2^{k+1}=2(2^k-1)+2^{k+1}=2^{k+1}-2+2^{k+1}=2\cdot 2^{k+1}-2=2^{k+2}-2=2(2^{k+1}-1)$

So, you have proved the initial statement

4 0

3 years ago

Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more de

Schach [20]

Circumference=2pir=<span>2∗3.14∗5.1</span><span>=30.028=30.03.</span>

4 0

3 years ago

Which solution is correct? Be sure to check for extraneous solutions.

denis23 [38]

That answer is d)x=-4

4 0

2 years ago

PLssssssssssssss help..

ddd [48]

Answer:

141.4

Step-by-step explanation:

i think

3 0

3 years ago