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Burka [1]
2 years ago
11

4.2x = 13.23 (i need help please!!! it'd mean a lot!!!) its solving equations btwwww

Mathematics
2 answers:
Semenov [28]2 years ago
7 0
Answer: x=3.15
All you do is divide 13.23 by 4.2
Yuliya22 [10]2 years ago
3 0

Answer: the answer would be 3.15 (and btw I just got off this subject in math)

Step-by-step explanation: The reason the answer is 3.15 is because you line up the question (basically how you have it) and divide 13.23 by 4.2 and you get 3.15, hope that helps ;)

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Use the Midpoint Rule and the given data to estimate the value of the integral I. (Give the answer to two decimal places.)
svlad2 [7]

Answer:

a) integral = 24.72

b) |Error| ≤ 0.4267

Step-by-step explanation:

a)

The integral:

\int_{0}^{3.2} f(x) dx

can be  approximated with the midpoint rule, as follows:

6.7*(0.8 - 0.0) + 8.9*(1.6 - 0.8) + 6.9*(2.4-1.6) + 8.4*(3.2 - 2.4) = 24.72

(that is, all the intervals are 0.8 units length and f(x) is evaluated in the midpoint of the interval)

b)The error bound for the midpoint rule with <em>n</em> points is:

|Error| ≤ K*(b - a)^3/(24*n^2)

where <em>b</em> and are the limits of integration of the integral and K = max |f''(x)|

Given that -5 ≤ f''(x) ≤ 1, then K = 5.  Replacing into the equation:

|Error| ≤ 5*(3.2 - 0)^3/(24*4^2) = 0.4267

5 0
3 years ago
Find the length of the diameter of circle 0
r-ruslan [8.4K]

Answer:

Diameter = 19.33

Step-by-step explanation:

Imaging a radius line from O to the endpoints of the 7. call this line R.

Label the part of the vertical line from O to the 90 degree intersection y.

Now you have a right triangle.

Using the Pythagorean theorem:

R² = 7² + y²

also

y = R - 3

substitute for y:

R² = 49 + (R-3)²

R² = 49 + R² - 6R + 9

simplify:

0 = 58 - 6R

6R = 58

R = 9.6667

Diameter = 2(9.6667) = 19.33

5 0
2 years ago
SKIP # 14 SHOW ALL WORK PLEASE AND I WILL GIVE BRAINLY AND 77 points for it
babunello [35]

Answers:

11. 48%

12. 25%

13. 36%

15. 93%

16. 99%

17. 0.16%

18. 160%

19. 85%

Work for 19:

The chart is incorrect because it calculates 40% of 34 instead of 40 percent of x (we got 85% for our answer but I'm using x as the unknown number) results in the number of 34.

Percentage of 40% of what number = 34?

40% of what number = 34 is equivalent to: 40% × ? = 34

--------------------------

40% × ? = 34

? =

34 ÷ 40% =

34 ÷ (40 ÷ 100) =

(100 × 34) ÷ 40 =

3,400 ÷ 40 =

85

Proof:

If 40% × 85 = 34 =>

Divide 34 by 85...

... And see if we get as a result: 40%

----------------------------------------------------------

20. 21 students

Step-by-step explanation:

I hope I helped, and I always appreciate brainliest!!! ;)

6 0
2 years ago
If a cable is 50 meters long. How much is that in decimeters?
zepelin [54]

Answer:

500 because when you dm yu multiply it

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
(7x +6) - (5x - 4) = 180
BartSMP [9]

Answer:

x= 85

Step-by-step explanation:

(7x+6)-(5x-4)=180

There is a negative 1 between the two parenthesis

-1(5x-4)

-5x+4

Now plug it back into the equation and take out the parenthesis

7x+6-5x+4= 180

2x+10=180    Now we can solve

    -10  -10

2x= 170

2x/2 = 170/2

x= 85

I hope this helps! :)

8 0
3 years ago
Read 2 more answers
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