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faust18 [17]
3 years ago
13

Can someone plz help me solved this problem I need help plz help me! Will mark you as brainiest!

Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
7 0

Answer:

260

20

Step-by-step explanation:

speed of plane= p

speed of wind =w

  • (p+w)*3=840
  • p+w=840/3=280

and

  • (p-w)*3.5=840
  • p-w= 840/3.5= 240

added up the 2 equations we get:

  • 2p= 280+240
  • p=260 mph

then

  • w= 20 mph
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Lincoln told his mother that 4 5/10
Sveta_85 [38]

Answer:

4.5

Step-by-step explanation:

In order to find the answer to this question you will first need to convert Lincolns height into a improper fraction and then convert the improper fraction into a decimal number.

L =4\frac{5}{10}

Convert into improper fraction

4\frac{5}{10} =10 \times4=40+5=45=\frac{45}{10}

Convert into decimal by dividing the numerator by the denominator:

45\div10=4.5

L=4.5

Hope this helps.

8 0
3 years ago
A ball is thrown into the air from a height of 9cm above the ground, and its height is given by S=128+32t-16t^2, where t is the
OverLord2011 [107]
-16t² + 32t + 128 = 0
-16t² + 64t - 32t + 128 = 0
-16t(t - 4) - 32(t - 4)
(-16t - 32)(t - 4) = 0
-16t -32 = 0      t - 4 = 0
-16t = 32          t = 4
t = -2

t = -2 and t = 4 are the values that makes S = 0.
Yes, because if you apply either of  these values alone, S will be 0.
6 0
4 years ago
Which value for x makes the sentence true?
4vir4ik [10]

Answer:

x = 2

Step-by-step explanation:

8x = 4x + 8

Subtract 4x from each side

8x-4x = 4x-4x + 8

4x = 8

Divide each side by 4

4x/4 = 8/4

x = 2

6 0
3 years ago
Read 2 more answers
What times what equals 234, but then if you add them you get 31
USPshnik [31]
13*18
x*y =234
x+y=31

we know the 2 # have to be double digits and both between 10-20

find 2 values that * to a number that ends in 4. Those are the ones value

1*4   11 and 14
2*2   12 and 12
3*8   13 and 18

only 13 and 18 add up to 31 and multiply to 234



6 0
4 years ago
A group of 10 people is choose a chairperson and vice-chairperson. They put all 10 peoples names into a bar. The first name draw
Tanzania [10]

Answer:

90

Step-by-step explanation:

A group of 10 people is choose a chairperson and vice-chairperson. They put all 10 peoples names into a bar. The first name drawn becomes chair. The second name drawn becomes vice-chair. How many possible combinations of chair and Vice-chair are there ?

This is calculated using the Permutation formula

nPr = n!/(n - r)!

Where:

n = 10 people

r = 2 = 2 positions to be filled , Chairman and Vice chairman

Hence:

10P2 = 10!/(10 - 2)!

= 90 ways

8 0
3 years ago
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