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
Sav [38]
3 years ago
12

Evaluate if w = –2.1 and z = 5.7. w – z – 4

Mathematics
2 answers:
balandron [24]3 years ago
7 0
The answer is -13.8 :)
Alex777 [14]3 years ago
5 0
The answer will be -13.8
You might be interested in
The function f(x)=70n -400 models the profit of the instructor of a guitar class per month, where n is the number of students en
suter [353]
Given:
f(x) = 70n - 400   : equation for monthly profit.
n = number of students enrolled in the guitar class.

70 refers to the amount charged per student.
400 is the fixed expense made by the instructor.

For the instructor to have a profit, the product of 70n must be more than 400.

400/70 = 5.7 or 6

There must be at least 6 students enrolled in class for the instructor to generate profit.

f(x) = 70(6) - 400 = 420 - 400 = 20

1000 = 70n - 400
1000 + 400 = 70n
1400 = 70n
1400/70 = n
20 = n

There must be 20 students enrolled in class for the instructor to earn 1000 in profit.

1000 = 70(20) - 400
1000 = 1400 - 400
1000 = 1000

3 0
3 years ago
(a) An article in a medical journal suggested that approximately 14% of such operations result in complications. Using this esti
aev [14]

This question is incomplete, the complete question is;

Surgical complications: A medical researcher wants to construct a

99.5% confidence interval for the proportion of knee replacement surgeries that result in complications.

- An article in a medical journal suggested that approximately 14% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.08?

Answer: a sample of operations needed is 149

Step-by-step explanation:

Given that;

confidence interval = 99.5% = 0.995 so

margin of error E = 0.08

p = 14% = 0.14

now we obtain the critical value of z t the 99.5 confidence interval

∝ = 1 - confidence interval

∝ = 1 - 0.995

∝ = 0.005

∝/2 = 0.0025

obtaining the area of probability in the right tail

Area of probability to the right is = 1 - 0.0025 = 0.9975

from probability table; critical value of t =2.81

using the formula

n = p( 1 - p ) [ (z_∝/2)/E)² ]

so we substitute  

n = 0.14 ( 1 - 0.14 ) [ 2.81 / 0.08 )²  

n = (0.14 × 0.86 ) × 1233.7656

n = 148.5453 ≈ 149

Therefore , a sample of operations needed is 149

4 0
3 years ago
Miss Kelly is taking 25 students on a field trip next week. 20 students have returned to their signed permission slip so far wha
Dmitry [639]
20% have not returned their slips.
6 0
3 years ago
Read 2 more answers
What is the measure of the vertex angle of an isosceles triangle if one of its base angle measures 34° and it’s congruent sides
KIM [24]

Let the vertex angle be x.

Base angles in the isosceles triangle are congruent.

Let the base angles be α=34°

Total sum of the inner angles in the triangle is 180°.

We can make equation

2α+x=180° => x=180-2α=180-68=112

The measure of the vertex angle is 112°

Good luck!!!

4 0
3 years ago
The school that Ted goes to is selling tickets to a choral performance. On the first day of ticket sales the school sold 7 adult
IrinaVladis [17]

Answer:

Adult= $24

child= $21

Step-by-step explanation:

first let's create an equation for each one.

Day 1: 7x+8y=168

day 2: 14x+13y=294

By doing so we can either graph and get the points for x,y or we can substitute each (x=0) (y=0) and solve manually.

x-int.= (24,0)

y-int.=(0,21)

3 0
3 years ago
Other questions:
  • A rectangular field is 90 yards wide and 140 yards long. give the length and width of another rectangular field that has the sam
    5·1 answer
  • I NEED HELP PLEASE <br> SO CONFUSED<br> EXTRA POINtS
    9·2 answers
  • To solve an equation of the form a • bx = d, you should first divide both sides by the coefficient _____.
    12·1 answer
  • Kinda stuck and would like help
    7·2 answers
  • mrs. west is 14 years younger than her aunt. if mrs. west’s age in years is as much below 60 as her aunt’s age is over 40, how o
    7·1 answer
  • The scale of a map is 1 1/4 inches = 100 miles. On the map, two rivers are 4 1/8 inches apart. What is the distance between the
    7·1 answer
  • Graph the function y=4/3x+3
    14·1 answer
  • Can sum1 help pls asap
    9·1 answer
  • I NEED HELP UNDERSTANDING BOTH OF THESE QUESTIONS
    5·1 answer
  • Find 1 rational number between -2/9 and 0
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!