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kondor19780726 [428]
3 years ago
12

Eight less than 7 times a number is -29​

Mathematics
2 answers:
spayn [35]3 years ago
6 0
-1????? Maybe I’m not sure
Zielflug [23.3K]3 years ago
6 0
The equation would be
7x-8=-29
you add 8 to both sides and get
7x=-21
you divide by 7 and get
x=-3
that’s the answer
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A’s DJ service charges a $200 setup fee and $75 an hour after that.
Bogdan [553]

The total cost includes the setup cost + per hour cost.

Let, x represents the time and y represents the total cost.

y=200+75x .... (1)

Let Y represent the cost for B's DJ service.

y=125x .... (2)

a. Graphing both the equations give the intersection point (solution) as (4,500)

It means for 4 hours, the total cost of both the DJ's is same at $500.

b. Substitution Method.

Plug y = 125x in equation (1)

125x= 200+75x

125x-75x=200

50x=200

x=4

y=125\times 4 =500

Hence, the total cost for 4 hours in both the service is $500.

c. Addition method.

Multiply equation (2) by -1

-y = -125x.... Equation (3).

Add euation (1) and equation (3)

y+(-y) = 200+75x-125x

0=200-50x

50x=200, x=4

y=500

Solution: For x = 4, y = 500 ( same as the previous two methods)

For x = 2, equation (1)

y=200+(75\times 2) = 350

For x = 2, equation (2)

y= 125\times 2 =250

Hence, for 2 hours, DJ B would be a better choice since it would charge $250.

For x = 6 hours, equation (1)

y=200+(75\times 6) =650

For x= 6, equation (2)

y=125\times 6=750

For 6 hours, DJ A would be  better option since it charges $650 for 6 hours.



8 0
3 years ago
F(x) = 4x^2+5x-12 evaluate f(-3)
Natali5045456 [20]
F(-3)=4(-3)^2+5(-3)-12
=36-15-12
=36-27
=-9
4 0
3 years ago
2. Weekly CPU time used by an accounting firm has a probability density function (measured in hours) given by
Zina [86]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
What is the 3rd term when 2y2 + 3y4 – 5y + 6y3 is arranged in descending order?
Hoochie [10]
Arranged in descending order means the terms are arranged in the order of the exponent, from the  largest to the smallest. the exponent is the little number up right to y, 
3y^4+6y^3+2Y^2-5y
so the third term is 2y^2
8 0
3 years ago
Find the values of x and y!!
riadik2000 [5.3K]

Answer:

1st option

Step-by-step explanation:

7x + 7 and 112 are vertically opposite angles and are congruent , then

7x + 7 = 112 ( subtract 7 from both sides )

7x = 105 ( divide both sides by 7 )

x = 15

4y and 112 are adjacent angles and sum to 180° , that is

4y + 112 = 180 ( subtract 112 from both sides )

4y = 68 ( divide both sides by 4 )

y = 17

3 0
2 years ago
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