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vovangra [49]
3 years ago
11

I need this to be an equation!! The difference between five times a number and four is 16!!

Mathematics
1 answer:
Katen [24]3 years ago
8 0
5x-4=16. I hope this helps :)
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Can someone please help me
Ad libitum [116K]
Square root both sides. The unreduced answer is root 28. Now. To reduce root 28, you need to break it down into factors and hope one of them is a perfect square. 

4*7=28, and 4 is a square number. The square root of 4 is either positive or negative 2. Now that you've found that square, pull it out from under the square root symbol. Under the root symbol, you're left with 7 (not a perfect square).

Therefore, your answer is C
7 0
3 years ago
Read 2 more answers
Researchers are concerned about the impact of students working while they are enrolled in classes, and they’d like to know if st
antoniya [11.8K]

Answer:

The 95% confidence interval based on this sample is =

[6.41, 7.79]

Step-by-step explanation:

The formula for Confidence Interval =

Mean ± z × standard deviation/√n

Sample mean = 7.1 hours

Standard deviation = 5 hours

n = 200 students

z = 95% confidence interval z score

= 1.96

C.I = 7.1 ± 1.96 × 5/√200

C.I = 7.1 ± 0.693

Hence, Confidence Interval

= 7.1 - 0.693

= 6.407

Approximately = 6.41

= 7.1 + 0.693

= 7.793

Approximately = 7.79

Therefore, the 95% confidence interval based on this sample is

[6.41, 7.79]

6 0
2 years ago
stephanie holds 30 cubes in a box. the cubes are 1/2 in each side. the box holds 2 layers with 15 cubes in each layer. what is t
TEA [102]

Answer:

3.75 Cubic Inches

Step-by-step explanation:

The volume of a single cube is 0.125 because the volume of a cube is its side length cubed, or to the third power. There are 30 cubes in the box, and 0.125 times 30 is 3.75

8 0
2 years ago
I need the answers someone helppppp..
Ad libitum [116K]
A. 6 because 30/5= 6
B. She has gotten 35 points because 7*5=35
6 0
3 years ago
A father is 32 years older than his son. In four years,
sergiy2304 [10]

Answer:

  • father: 36
  • son: 4

Step-by-step explanation:

Let s represent the son's age now. Then s+32 is the father's age. In 4 years, we have ...

  5(s+4) = (s+32)+4

  5s +20 = s +36 . . . . . eliminate parentheses

  4s = 16 . . . . . . . . . . . . subtract s+20

  s = 4

The son is now 4 years old; the father, 36.

_____

<em>Alternate solution</em>

In 4 years, the ratio of ages is ...

  father : son = 5 : 1

The difference of their ages at that time is 5-1 = 4 "ratio units". Since the difference in ages is 32 years, each ratio unit must stand for 32/4 = 8 years. That is, the future age ratio is ...

  father : son = 40 : 8

So, now (4 years earlier), the ages must be ...

  father: 36; son: 4.

5 0
3 years ago
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