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GarryVolchara [31]
3 years ago
8

7+2/5x=1 I don't know how to do this problem ​

Mathematics
2 answers:
fenix001 [56]3 years ago
7 0

Answer:

x = -15

Step-by-step explanation:

7 + 2/5 x = 1

Subtract 7 from each side

7-7 + 2/5 x = 1-7

2/5x = -6

Multiply by 5/2 to isolate x

5/2 * 2/5x = -6*5/2

x = -15

Naya [18.7K]3 years ago
3 0
7*5+2/5*5x=1*5
35+2x=5
2x=5-35
2x=-30
2x/2=-30/2
x=-15
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6. Tony is going to buy a new bike. The bike costs $120.50. If Tony uses a 25% coupon how much will he
Kruka [31]

Answer:

$90.38

Step-by-step explanation:

25% of $120.50 is $30.125

$120.50 - $30.125 = $90.375 rounded to $90.38

6 0
3 years ago
steve measured the length of his room and found it to be 9 feet and 6 inches. The width of his room was 11 feet exacly. What is
Art [367]
Length: 114 in.
Width: 132 in.

For length, you have 9 feet and 6 inches. Meaning that if you would want to get the length of his room in inches, you would have to multiply 9 with 12 and add 6.

It's the same thing for the width.

If you need more help comment below!
4 0
3 years ago
You need 250 mL of a 90% alcohol solution. On hand, you have a 75% alcohol mixture. How much of the 75% alcohol mixture and pure
stich3 [128]

9514 1404 393

Answer:

  • 100 mL of 75% solution
  • 150 mL of pure alcohol

Step-by-step explanation:

Let x represent the quantity (in mL) of pure alcohol needed for the mix. Then the amount of 75% needed is (250-x). The amount of alcohol in the mixture is ...

  1.00x +0.75(250 -x) = 0.90(250)

  0.25x +187.5 = 225 . . simplify

  0.25x = 37.5 . . . . . . . . subtract 187.5

  x = 150 . . . . . . . . . . . . . divide by 0.25

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You need 100 mL of the 75% solution and 150 mL of pure alcohol to obtain the desired mixture.

8 0
3 years ago
I need help can you help me?
UNO [17]
The remaining 2 debts have to add up to a cetain number which I represent as x.
476.25 - 93.22 - x = 0
x = 383.03
The correct two debts should add up to -383.03.
Therefore the answer is B. -66.72 and -316.31
7 0
3 years ago
if the sum of the first 60 positive integers is s, what is the sum of the first 120 integers in terms of s? a. 2s 3600 b. s^2 36
natima [27]
For the first 60 positive integers, a = 1, n = 60, l = 60.
Sn = n/2(a + l)
s = 60/2(1 + 60) = 30(61)

For the next 60 positive integer, a = 61, n = 60, l = 120
Sum = 60/2(61 + 120) = 30(61 + 120) = 30(61) + 30(120) = s + 3600

Sum of first 120 positive integers = s + s + 3600 = 2s + 3600
3 0
3 years ago
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