1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sp2606 [1]
2 years ago
11

Solve for x: 7x + 15 = 38

Mathematics
1 answer:
olganol [36]2 years ago
7 0
7x + 15 = 38
7x = 38 - 15
7x = 23
x = 23/7 (twenty- three sevenths)
You might be interested in
A lake polluted by bacteria is treated with an antibacterial chemical. Aftertdays, thenumber N of bacteria per milliliter of wat
jeyben [28]

Answer:

N(1)=50 is a minimum

N(15)=4391.7 is a maximum

Step-by-step explanation:

<u>Extrema values of functions </u>

If the first and second derivative of a function f exists, then f'(a)=0 will produce values for a called critical points. If a is a critical point and f''(a) is negative, then x=a is a local maximum, if f''(a) is positive, then x=a is a local minimum.  

We are given a function (corrected)

N(t) = 20(t^2-lnt^2)+ 30

N(t) = 20(t^2-2lnt)+ 30

(a)

First, we take its derivative

N'(t) = 20(2t-\frac{2}{t})

Solve N'(t)=0

20(2t-\frac{2}{t})=0

Simplifying

2t^2-2=0

Solving for t

t=1\ ,t=-1

Only t=1 belongs to the valid interval 1\leqslant t\leqslant 15

Taking the second derivative

N''(t) = 20(2+\frac{2}{t^2})

Which is always positive, so t=1 is a minimum

(b)

N(1)=20(1^2-2ln1)+ 30

N(1)=50 is a minimum

(c) Since no local maximum can be found, we test for the endpoints. t=1 was already determined as a minimum, we take t=15

(d)

N(15)=20(15^2-2ln15)+ 30

N(15)=4391.7 is a maximum

7 0
3 years ago
I got the answer as letter C, can someone check me to make sure that is correct? Thank you in advance.
Flura [38]

Answer:

The x's cancel  so definitely is choice C:  1/9

Step-by-step explanation:

We have   root( 1/(x^2) )  *  root ((x^2) / 81)

simplifying this we get as follows:

root( 1/(x^2) )  *  root ((x^2) / 81)

= \sqrt{(1/x^2 )}  * \sqrt{(x^2)/81}

=  ( 1/x )   *  (x/9)

the x's cancel

= 1/9

choice C   1/9

3 0
3 years ago
What is an equation that is equivalent to -3/4x+1/8=-3/8?
Nonamiya [84]

Hope this helps! Follow my Instagram trlamb822!

3 0
3 years ago
A recipe calls for 3 cups of flour, 2 cups of sugar and 1 cup of milk. Mason is going to use 7 cups of sugars instead. how much
AlexFokin [52]

Answer:

We need to make a conversion for the new recipe. If the regular recipe calls for 2 cups of Sugar, we can make a conversion for the new recipe.

Step-by-step explanation:

Conversion- 2:7= 1:4  (sugar)

2:7 (sugar)

3: x (flour)

1: y (milk)

X= 8 (flour)

Y= 6 (milk)

NEW RECIPE:

3.5 cups of milk

10.5 cups of flour

7 cups Sugar

We found this by seeing the new recipe adds 5 more cups with the original amount :)

5 0
3 years ago
Read 2 more answers
See if you can answer this brainbop72
77julia77 [94]

Answer:

24,456 is 2

3 is whatever u say

and 1 is 641,086 divided my 41,616

8 0
3 years ago
Other questions:
  • What units would you use for each scenario that follows?
    12·1 answer
  • Solve for the area of ΔABC to the nearest tenth. A) 9.0 cm2 B) 18.1 cm2 C) 36.2 cm2 D) 72.4 cm2
    8·1 answer
  • Natalie has $5000 and decides to put her money in the bank in an account that has a 10% interest rate that is compounded continu
    9·1 answer
  • 3x+2y=10 Solve the equation for y
    10·2 answers
  • Shelia mows 1/6 acre in 1/4 hour. How many acres does she mow in per hour?
    7·1 answer
  • Find the vertex, the equation and axis of symmetry, and the y-intercept of the graph of y=2x^2-8x+6
    14·1 answer
  • An angle that is one half its arc is a/n
    13·1 answer
  • A triangle has two angle measures of 20 degrees and 30 degrees. Find the third angle. This triangle is a(n) ________ triangle
    11·2 answers
  • 16 + 2q = 6 what’s this?
    6·1 answer
  • I need help with 9 and 10
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!