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
Anuta_ua [19.1K]
2 years ago
11

If P = -5, and Q = -15 find (P + Q) x (P - Q)​

Mathematics
1 answer:
o-na [289]2 years ago
5 0

Answer:

-200

Step-by-step explanation:

We are given that:

  • P= -5
  • Q= -15

Simply insert this values into their correspondents in the equation given.

(-5 + (-15)) * (-5 - (-15))

Subtracting two negatives is like adding a positive and a negative.

(-5 + (-15)) * (-5 + 15)

Solve inside the parenthesis.

(-20) * (10)

Multiply.

-200

You might be interested in
Concert marketing: The college’s performing arts center wanted to investigate why ticket sales for the upcoming season significa
matrenka [14]

Answer:

Correct options are A,B,D:

  • The sample needs to be random, but we don't know if it is.
  • The actual count of community residents who received the concert brochure by mail is too small.  
  • n(1 minus p‐hat) is not greater than 10.

Step-by-step explanation:

Concert marketing: The college’s performing arts center wanted to investigate why ticket sales for the upcoming season significantly decreased from last year’s sales. The marketing staff collected data from a survey of community residents. Out of the 110 people surveyed, only 7 received the concert brochure in the mail.

4 0
3 years ago
A teacher asks students to list the math lessons they learned on nine random school days in the past month. She evaluates the st
zysi [14]

Answer:

Simple random sampling

Step-by-step explanation:

Hope this work :)

5 0
2 years ago
A chemist has three different acid solutions. The first acid solution contains 25 % acid, the second contains 45 % and the third
liq [111]

Answer:

Wyzant

ALGEBRA WORD PROBLEM

Dorian S. asked • 06/28/17

THREE LINEAR EQUATIONS WITH THREE VARIABLES

A chemist has three different acid solutions. The first acid solution contains 15% acid, the second contains 25%,

and the third contains 70%. He wants to use all three solutions to obtain a mixture of 40 liters containing 45%

acid, using 2 times as much of the 70% solution as the 25% solution. How many liters of each solution should be used?

How to set up as three linear equations to find the answer?

Follow2

Add comment

More

1 Expert Answer

By:

Best

Arthur D. answered • 06/28/17

TUTOR 4.9 (67)

Forty Year Educator: Classroom, Summer School, Substitute, Tutor

ABOUT THIS TUTOR ›

set up 2 equations

the first equation...

15%*x+25%*y+70%*2y=45%*40

0.15x+0.25y+1.4y=0.45*40

0.15x+1.65y=18

multiply all terms by 100

15x+165y=1800

divide all terms by 15

x+11y=120

the second equation...

x+y+2y=40

x+3y=40

x=40-3y

substitute into the first equation x+11y=120

40-3y+11y=120

40+8y=120

8y=120-40

8y=80

y=80/8

y=10 liters

x+3*10=40

x+30=40

x=40-30

x=10 liters

10 liters of 15%, 10 liters of 25%, and 20 liters of 70%

check:

10*15%=1.5

10*25%=2.5

20*70%=14

1.5+2.5+14=18

18/40=9/20=45/100=45%

45%*40=18

hope it helps

please mark brainliest

8 0
3 years ago
Ž + 1 = 9<br> Ox = 16<br> x = 20<br> Ox = 4<br> Ox=5
kotykmax [81]

Answer:

x = 16

Step-by-step explanation:

x

-- = 9-1 ...... first shift 1 and it will be -1

2

x = 8 ....... secondly 9-1 =8

--

2

x = 16 ..... criss cross and 2×8 = 16

there fore the value of x is equals to 16.

you can check it!

4 0
3 years ago
Somebody help me with this
zubka84 [21]

Answer:

1

Step-by-step explanation:

when multiplying fractions it doesn’t matter if they have the same denominator (bottom) just multiply straight across

(6/12)x(6/3)

36/36

1

4 0
2 years ago
Other questions:
  • A building casts a 17-foot shadow. A 6-foot man standing next to the building casts a 2.5-foot shadow. What is the height, in fe
    5·1 answer
  • Find the measures of two angles, one positive and one negative, that are coterminal with the given angle.
    7·2 answers
  • You start driving north for 48 miles, turn right, and drive east for another 14 miles. At the end of driving, what is your strai
    15·2 answers
  • 6409 divided by 61 = ?
    13·2 answers
  • Everything else right but just can’t figure that fraction out.
    8·1 answer
  • Two Triangles Are similar, The area of the larger triangle is 563 feet squared. What is the area of the smaller triangle to the
    15·1 answer
  • What is the solution for xsquared= 64
    8·1 answer
  • What is the slope between (2, 7) and (3, 3)
    13·1 answer
  • The temperature in Vancouver was recorded over a period of four hours. The equation y = -2x + 43 describes the temperature over
    13·2 answers
  • Given the following rectangle and circle, at what approximate value of x are the two areas equal? x ≈ 5.8 x ≈ 3.4 The curves do
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!