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alekssr [168]
3 years ago
8

HELP ME PLEASE!!!this is due in 10 minutes

Mathematics
2 answers:
quester [9]3 years ago
6 0

I believe that it is (B).

tatiyna3 years ago
3 0

Answer:

a) x = 4 cm

Step-by-step explanation:

x + 2x + 2x = 20 cm

5x = 20

x = 4 cm

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trapecia [35]

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3 years ago
108 is 36% of what number? Write and solve a proportion to solve the problem
eduard
108 = .36x
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3 years ago
What polynomial has roots of −5, −4, and 1?
katrin [286]

Answer:

The last choice.

Step-by-step explanation:

The  last term is  - 20 and because we have a coefficient of 1 on the x^3,  and in order to get this last term  and the given roots the factors have to be

(x  + 5)(x + 4)(x - 1)  so it is the last option.

3 0
3 years ago
The number of bacteria in a petri dish is 524 and growing at a rate of 7% every month.
kicyunya [14]
This is an exponential growth problem.
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7 0
3 years ago
Read 2 more answers
Please help ?!!! Solve the three equations in the table using any method of your choice. List the method you used.
KatRina [158]

Step-by-step explanation:

x =  \frac{ - b \frac{ + }{ - }  \sqrt{ {b}^{2} - 4ac } }{2a}

The quadratic formula is honestly the most straightforward way of solving here.

Your other options are completing the square (which is the same thing as the quadratic formula but it's good to know that method if you have to take Integral Calculus at some point) or maybe factoring by grouping if it's appropriate. But the quadratic formula will work for you in all three equations:

1) a=1, b=0, c=8

This reduces pretty quickly into x=8i,-8i due to the negative under the radical. (Actually we didn't even really need the formula here.)

2) a=-9, b=4, c=-10

This reduces into x=(-4+i√(344))/-18, (-4-i√(344))/-18 and doesn't go any further because 344 isn't a perfect square.

3) a=1, b=8, c=17

This reduces to x=(-4+i), (-4-i)

So those are the answers for each.

3 0
3 years ago
Read 2 more answers
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