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
liq [111]
3 years ago
7

3. "a varies directly with b". If a = 4 when b = 21, find a when b-7.

Mathematics
2 answers:
Irina-Kira [14]3 years ago
8 0

Step-by-step explanation:

A(promotional sign)b

A=kb

4=21k

K=0. 1904

A=0. 2b

A=0. 2×7

A=1. 4

goldfiish [28.3K]3 years ago
7 0

:

Step-by-step explanation:

a varies directly with b

a ∞ b

a = Kb

K is the constant of proportionality

If a = 4 when b = 21

4 = 21×k

4 = 21k

k = 4/21

: - a = 4b/21

find a when b= 7.

a = 4(7)/21

a = 4/3

a = 1 1/3

You might be interested in
Express the following as Decimal place 75%
Katyanochek1 [597]

Answer:

Step-by-step explanation:

75% = 75/100 = 0.75

6 0
3 years ago
Read 2 more answers
Normal text
Gnoma [55]

Answer:

your mom

Step-by-step explanation:

3 0
2 years ago
Write a quadratic function in vertex form whose graph has the vertex
ELEN [110]

Answer:

y = \frac{1}{2}(x - 5)² - 2

Step-by-step explanation:

The equation of a parabola in vertex form is

y = a(x - h)² + k

where (h, k) are the coordinates of the vertex and a is a multiplier

Here (h, k) = (5, - 2), thus

y = a(x - 5)² - 2

To find a substitute (7, 0) into the equation

0 = a(7 - 5)² - 2

0 = 4a - 2 ( add 2 to both sides )

2 = 4a ( divide both sides by 4 )

a = \frac{2}{4} = \frac{1}{2}

y = \frac{1}{2} (x - 5)² - 2 ← in vertex form

4 0
2 years ago
A rectangular solid has width w, a length of 7 more than the width, and a height that is equivalent to 15 decreased by 3 times t
Helen [10]

Answer:

njgrjn djgb E THE ANSWER IS 3

Step-by-step explanation:

jbuyf6ctvyhbjnkmljinhubygvtb njmkbbhjcghxfgvjctguhvjhbjbhbyguyc

7 0
2 years ago
The length of XY the minor arc is 48 cm what is the circumference of Z
Amanda [17]
If found the image that accompanies this problem, the central angle was 60°. Since the circumference of a circle is always 360°, the minor arc represents 60°/360° of the circle.

48 cm / (60°/360°) = 48 cm / (1/6) = 48 cm * 6/1 = 48 cm * 6 =  288 cm

The circumference of circle Z is 288 cm.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Please help me
    5·1 answer
  • What is the area of a right triangle with a height of 8.9 and a base of 14.3?
    14·1 answer
  • A company is making building blocks what is the length of each side of the block?
    13·2 answers
  • -6x+4y=-4 -6x+2y= 4 solve for x and y
    11·1 answer
  • Type the value of the ? below.
    12·2 answers
  • Multiple choice<br> thanks
    11·2 answers
  • PLZ IT'S VERY IMPORTANT<br>Find the perimeter​
    8·1 answer
  • Please please help please please
    8·1 answer
  • Consider the inequality x &gt; - 1.5. determine whether each value of x makes this inequality true
    12·1 answer
  • Find the value of x 29 (6x + 1)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!