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
Sloan [31]
3 years ago
12

Solve 5r2 – 12 = 68. {±4} {±5} {±3} {±6}

Mathematics
2 answers:
djyliett [7]3 years ago
7 0
5r2-12=68
+12 +12
5r2 = 80
-80
5r2 -80 = 0
÷5 ÷5 ÷5

r2 -16 = 0
+16 +16
r2 = 16

root: r2 = root: 16
r = {+/- 4}

Airida [17]3 years ago
3 0

Add 12 to both sides:

5r^2 = 80

Divide by 5:

r^2 = 16

Square root both sides:

r = +/- 4

The answer is {+/- 4}.

You might be interested in
Integers. What divided by -18 = 23
kifflom [539]

Answer:

x=−414

Step-by-step explanation:

Let's solve your equation step-by-step.

x

−18

=23

Step 1: Multiply both sides by -18.

x

−18

=23

(

x

−18

)*(−18)=(23)*(−18)

x=−414

4 0
3 years ago
There are 8 blue marbles and 7 red marbles in a bag. Julie pulls two marbles at random from the bag first. What is the probabili
konstantin123 [22]

Answer:

either a ratio 8;7. or a percentage of 53% for picking the blue marble first i think and a 50/50 chance if you keep that blue marble out.

Step-by-step explanation:


4 0
3 years ago
Read 2 more answers
Given f(x) = 4x - 3 and g(x) = 7x +5, find f(x) + g(x).
raketka [301]

Answer:

Given f(x) = 2x + 3 and g(x) = –x2 + 5, find (g o f )(x).

(g o f )(x) = g( f(x))

   = g(2x + 3)

   = –(           )2 + 5    ... setting up to insert the input

   = –(2x + 3)2 + 5

   = –(4x2 + 12x + 9) + 5

   = –4x2 – 12x – 9 + 5

   = –4x2 – 12x – 4

Step-by-step explanation:

4 0
4 years ago
Read 2 more answers
The altitude of an equilateral triangle is 15. What is the length of each side?
Bogdan [553]
An equilateral triangle is a triangle where all sides are of equal lengths. So, the angles are of equal values as well which is 60. We use the angle and the height of the triangle to determine the side length. We do as follows:

tan (60) = 15 / base/2
base = 10√3 = side length
6 0
3 years ago
Business math question(can't figure out how to solve this one):
olga nikolaevna [1]

85i think the answer would be

5 0
3 years ago
Read 2 more answers
Other questions:
  • the lenght of a picture is 67 centimeters. the width of the picture is 40 centimeters. how many more centimeters is the length t
    11·1 answer
  • Please help, will grant brainliest if correct, I need now. I CANNOT fail !!
    10·1 answer
  • There are 5 marbles in a bag. 3 are green, and 2 are yellow. You draw a marble, do not replace it, and then draw another. What i
    11·1 answer
  • If an object is dropped from a tall building, then the distance (in feet) it has fallen after t seconds is given by the function
    9·2 answers
  • I need help with number 6.
    15·1 answer
  • 2. Write an expression using fractions to show how to determine the amount that each person will pay. Then calculate each person
    14·1 answer
  • 3.6 - 5.6n - 4n + 8<br> Simplify the expression
    13·2 answers
  • Help see the screenshot below! !
    14·2 answers
  • Plsss help me with this if you know how to solve this plsss help me with it thank you also remember NO LINKS AND NO DOING IT JUS
    12·1 answer
  • Need help thank you very
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!