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IgorLugansk [536]
3 years ago
10

Please help ASAP I need work and answers

Mathematics
1 answer:
Nesterboy [21]3 years ago
8 0

Answer:

14.1.5 hours

15. 7 hours

Step-by-step explanation:

14.

225÷(70+80)=225÷150=1.5 Hours

15.

time taken=56÷(3+5)=7 Hours

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Solve using the quadratic formula 2x^2+8x-5=0
Ede4ka [16]

Step-by-step explanation:

Hey there!!

Given,

{x}^{2}  + 8x - 5 = 0

Comparing it with ax^2+bx+c =0 we get,

a= 1, b= 8, c= -5.

Using formula,

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

Keep all values,

x =   \frac{ - 8 +  -  \sqrt{ {8}^{2}  - 4 \times 1 \times ( - 5)} }{2 \times 1}

x =  \frac{ - 8 +  -   \sqrt{64 + 20}  }{2}

x =    \frac{ - 8 +  -  \sqrt{84} }{2}

x =  \frac{ - 8 +  - 2 \sqrt{21} }{2}

Taking negative,

x =   \frac{ - 8 - 2 \sqrt{21} }{2}

x =   \frac{ - 2(4 +  \sqrt{21}) }{2}

x = 4 +  \sqrt{21}

Similarly, taking positive,

x =  \frac{ - 8 + 2 \sqrt{21} }{2}

x =  \frac{ - 2(4 -  \sqrt{21} ) }{2}

x = 4 -  \sqrt{21}

Therefore, x= (4 + root 21, 4 - root 21).

<em><u>Hope it helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

3 0
3 years ago
Multiply.<br><br> 338⋅413<br><br><br> 718<br><br> 1218<br><br> 1438<br><br> 1458
mixas84 [53]

Answer:

14 5/8

Step-by-step explanation:

I took the test

8 0
3 years ago
What is the gcf of 16xy and 24xy<br><br> I was supposed to finish this an hour ago
OleMash [197]
The GCF is 8xy

Hope this helps
6 0
3 years ago
Read 2 more answers
On which of the following lines does the point (7, 1) lie?
stealth61 [152]
We have that
<span>the point (7, 1)

case </span><span>A.) y = 5x + 4
if the point </span>(7, 1) lie to the line
so
for x=7 the value of y must be  1
y=5*7+4------> y=39
39 is not 1---------> the point does not belong to the line

case <span>B.) y = -x + 8
</span>if the point (7, 1) lie to the line
so 
for x=7 the value of y must be  1
y=-7+8------> y=1--------> the point belongs to the line

case <span>C.) y = x - 10
</span>if the point (7, 1) lie to the line
so 
for x=7 the value of y must be  1
y=7-10------> y=-3
-3 is not 1---------> the point does not belong to the line

case <span>D.) y = -4x + 3
</span>if the point (7, 1) lie to the line
so 
for x=7 the value of y must be  1
y=-4*7+3------> y=-25
-25 is not 1---------> the point does not belong to the line

the answer is the option
 B.) y = -x + 8
6 0
3 years ago
Vivian is getting a pet snake. She is choosing between the ball python and the corn snake. the ball python is 4 1/2 ft long and
Nadusha1986 [10]

Answer:

The 45 in snake is the shorter one.

Step-by-step explanation:

Which is shorter, 45 in or 4 1/2 ft?

                                                                                        12 in

Convert 4 1/2 ft into inches by multiplying 4 1/2 ft by --------- = 54 in.

                                                                                          1 ft

Thus, the 45 in snake is shorter than the 54 in one and should b e V's first choice.

8 0
4 years ago
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