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4 years ago

Y= -xsquared + 5x -17

Mathematics

1 answer:

kirza4 [7]4 years ago

7 0

x-intercept(s):

(−5−√93/2,0),(−5+√93/2,0)

y-intercept(s):

(0,−17)

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How long is wire 1? I'll give brainliest.

nevsk [136]

Answer:

45.050 or rounded, 45

Step-by-step explanation:

$cos41=\frac{34}{x}$

since x is at the bottom then switch

$\frac{34}{cos41}$ which is 45.050

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3 years ago

Can an area of a polygon be zero?<br><br> true or false

Nata [24]

False. If the area is 0 that means there is nothing there, therefore the area of a polygon cannot be zero.

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3 years ago

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Find the solution to the system. Write your solution as an ordered pair (x,y) with no spaces, no solution, or infinitely many. X

chubhunter [2.5K]

Answer:

(15, 11).

Step-by-step explanation:

Given the system of equation;

X=2y-7 ..... 1

4x+y=71 ....2

Substitute 1 into2;

4(2y-7) + y = 71

8y - 28 + y = 71

9y - 28 = 71

9y = 71 + 28

9y = 99

y = 11

Substitute y = 11 into 1;

x = 2y - 7

x = 2(11)-7

x = 22-7

x = 15

hence the solution to the equation is (15, 11).

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3 years ago

The value of the 3 in 30,000 is____<br> times the value of the 3 in 3,000.*

Mekhanik [1.2K]

Answer:

Step-by-step explanation:

Multiply:

3,000 x 10 = 30,000

The value of 3 in 30,000 is in the ten thousands place. The value of 3 in 3,000 is in the thousands place. You multiply 10 to the thousands to get ten thousands, ∴ 10 is your answer.

8 0

3 years ago

Read 2 more answers

If you were asked to convert 75 m/s to km/hr, which conversation factors would you need to use. Select all that apply.

Vilka [71]

Answer:

You need to use A, B, and C.

Step-by-step explanation:

Let's treat the units as variables. I'll illustrate why in a moment.

$75 m/s =\frac{75m}{1s} \\\\\frac{75m}{1s}*\frac{1km}{1000m}=\frac{75m*km}{1000m*s}\\\\\frac{75m*km}{1000m*s}*\frac{60s}{1min}=\frac{(75*60)m*km*s}{1000m*s*min}\\\\\frac{4500m*km*s}{1000m*s*min}*\frac{60min}{1h}=\frac{4500m*km*s*min}{1000m*s*min*h}$

Now, as you can see, we have a giant mess of units to deal with. This is where we can treat the units like separate variables and use a bit of algebra to make our lives easier:

$\frac{4500m*km*s*min}{1000m*s*min*h}=\frac{4500}{1000}*\frac{m*km*s*min}{m*s*min*h}\\\\\frac{4500}{1000}*\frac{m*km*s*min}{m*s*min*h}=\frac{4500}{1000}*\frac{m}{m}*\frac{km}{1}*\frac{s}{s}*\frac{min}{min}*\frac{1}{h}\\\\\frac{4500}{1000}*\frac{m}{m}*\frac{km}{1}*\frac{s}{s}*\frac{min}{min}*\frac{1}{h}=\frac{4500}{1000}*\frac{m*km*s*min}{m*s*min*h}=\frac{4500}{1000}*1*\frac{km}{1}*1*1*\frac{1}{h}\\\\\frac{4500}{1000}*1*\frac{km}{1}*1*1*\frac{1}{h}=\frac{4500}{1000}*\frac{km}{h}\\$

$\frac{4500}{1000}*\frac{km}{h}=\frac{45}{1}*\frac{km}{h}=45 \frac{km}{h}$

So, backtracking through that entire mess, we had to use $\frac{1km}{1000m} ,\frac{60s}{1min} ,\frac{60min}{1h}$ .

These correspond to the options of A, C, and B accordingly.

So you need to use A, B, and C.

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3 years ago