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3 years ago

3(4k+5) – 14k +5+5= how do you solve this

Mathematics

1 answer:

Schach [20]3 years ago

3 0

Answer:

3(4k+5)-14k+5+5=4k

Step-by-step explanation:

Parentheses

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and also when you add the numbers the k just remains behind your solution

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Solve 5x^2 = -30x - 65

Oxana [17]

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3 years ago

Assume a student shows up for EGR 280 completely unprepared and the instructor gives a pop quiz. Assume there are 6 questions, e

Kisachek [45]

Answer:

P=20%

Step-by-step explanation:

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Probability=#of desired outcomes / #of possible outcomes

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3 years ago

7.5E-12= write the expression in scientific notation

Alex777 [14]

Answer:

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Step-by-step explanation:

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3 years ago

A farmer has 100 m of fencing to enclose a rectangular pen.

Natasha2012 [34]

A(w) = 50w-w^2

rewrite it as y = -w^2 +50w

using quadratic formula y = ax^2 +bx +c
a would equal -1, b = 50 and c = 0

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so x = -50 / 2(-1) = -50/-2 = 25

so the width = 25 m

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7 0

3 years ago

Read 2 more answers

H=255-21t-16t^2<br><br> PLEASE HELP!!

Colt1911 [192]

Answer:

3.15 seconds is the answer.

<u>Explanation</u>

when the ball touches the ground, h =0

hence,

0=255-21t-16t²

16t²+21t-225=0

here a=16 ,b=21, c= -225

$t= \frac{ - b± \sqrt{ {b }^{2} - 4ac} }{2a} \\ \\ t= \frac{ - 21± \sqrt{ {21}^{2} - 4 \times 16 \times - 225} }{2 \times 16} \\ = \frac{ - 21 ± \sqrt{441 - ( - 14400)} }{32} \\ = \frac{ - 21± \sqrt{14841} }{32} \\ = \frac{ - 21±121.82}{32} \\ \\ t = \frac{ - 21 + 121.82}{32} \: or \: \: t = \frac{ - 21 - 121.82}{32} \\ t = 3.15 \: \: or \: \: t = - 4.46$

time cannot be negative, hence t = -4.46 can be avoided

The ball takes 3.15 seconds to hit the ground.

4 0

3 years ago