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
aleksley [76]
3 years ago
11

Help? mathhhhhhhhhhhhhhhhhhhhhhhhhhhh

Mathematics
1 answer:
Vanyuwa [196]3 years ago
4 0

Answer:

a + 20 = 7*12 (multiplied both sides by 12)

a + 20 = 84 (calculated 7*12)

a = 84 - 20 (subtracted 20 on both sides)

a = 64 (calculated 84-20)

You might be interested in
6&gt;z-4<br> PLEASE ANSWER QUICKLY
Andru [333]

Answer:

10>z

Step-by-step explanation:

add 4 to both sides

5 0
3 years ago
The length of a rectangle is 3 inches longer than half of its width. The area of the rectangle is 416 square inches. How many in
Pie

Answer:

C. 26 Inches

Step-by-step explanation:

Using process of elimination you can tell the answer. 26*(13+3)=416

8 0
3 years ago
Keith works 8 hours per day for 5 per week. melba works 2,250 minutes each week. who spends more time at work
Orlov [11]

Answer:

Keith does.

Step-by-step explanation:

2250/60=37.5

8*5=40

Keith spends 40 hrs at work Melba spends 37.5 hrs.

6 0
3 years ago
The age of some lecturers are 42,54,50,54,50,42,46,46,48 and 48 calculate the mean age and standard deviation
rjkz [21]

Answer:

Mean age: 48

Standard deviation: 4

Step-by-step explanation:

a) Mean

The formula for Mean = Sum of terms/ Number of terms

Number of terms

= 42 + 54 + 50 + 54 + 50 + 42 + 46 + 46 + 48+ 48/ 10

= 480/10

= 48

The mean age is 48

b) Standard deviation

The formula for Standard deviation =

√(x - Mean)²/n

Where n = number of terms

Standard deviation =

√[(42 - 48)² + (54 - 48)² + (50 - 48)² +(54 - 48)² + (50 - 48)² +(42 - 48)² + (46 - 48)² + (46 - 48)² + (48 - 48)² + (48 - 48)² / 10]

= √-6² + 6² + 2² + 6² + 2² + -6² + -2² + -2² + 0² + 0²/10

=√36 + 36 + 4 + 36 + 4 + 36 + 4 + 4 + 0 + 0/ 10

=√160/10

= √16

= 4

The standard deviation of the ages is 4

3 0
3 years ago
Elementary school students spend 1/6 of their day at recess on average. If they are in school 6 1/2 hours a day, how much time i
Alex17521 [72]
6 and 1/2= 13/2. 13/2*1/6=13/12 so they spent 1 and 1/12 of an hour on recess

5 0
3 years ago
Read 2 more answers
Other questions:
  • Determine the factors of x2 − 8x − 12.
    8·2 answers
  • On a piece of paper graph f(x)=-1
    15·2 answers
  • 12 spheres of the same size are made from melting a solid cylinder of 1 cm diameter and 2 cm height. Find the diameter of each s
    8·1 answer
  • Pls help me solve this!
    6·1 answer
  • Q supp r and m q =22 degrees
    7·2 answers
  • Find the derivative of f(x) = -2x2 + 11x at x = 9.
    5·1 answer
  • Mrs. Murphy earns a 3.5% commission at her job in retail. How much does she need to sell in order to earn $630
    10·2 answers
  • Which graph represents the function f (x) = StartFraction 2 Over x minus 1 EndFraction + 4?
    5·1 answer
  • Simplify<br> (m^3)^6 - m^18
    7·2 answers
  • A and B are two cities.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!