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marysya [2.9K]
3 years ago
6

PLEASE HELP 15 POINTS!!

Mathematics
1 answer:
tigry1 [53]3 years ago
3 0
28. 6x+42-20=6x
42-20=0
42-20 gives you 22
22=0
Statement is false

30. -2x-4=-2x-3-1
-2x-4=-2x-4
Statement is true because both sides are identical

32. 2x+8-5=2x+3
8-5=3
3=3
Statement is true for any value of x

34. 3x+(x+4)=18
3x+x+4=18
4x+4=18
4x=18-4
4x=14 (next divide both sides by 4)
x= 7 over 2
7/2
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How do you solve this whole thing please?
NemiM [27]

Answer:

Step-by-step explanation:

Let's look at the first two, and hopefully you'll be able to figure the rest out:

1. Answer below

d = rt

The problem asks us to solve for r, so that means we need to get r on one side of the equation by itself. To do so, we will need to divide both sides of the equation by t:

\frac{d}{t} = \frac{rt}{t}

\frac{d}{t} = r

2. Answer below

B = T - Lc

The problem asks us to solve for T, so that means we need to get T on one side of the equation by itself. To do so, we will need to add Lc to both sides of equation:

B + Lc = T - Lc + Lc

B + Lc = T

7 0
3 years ago
The Oliver Company plans to market a new product. Based on its market studies, Oliver estimates that it can sell up to 5,500 uni
Ghella [55]
<span>For the Oliver Company to break even, the total revenue must equal the sum of the variable costs and the fixed cost. Mathematically, this can be represented as: Total revenue = 0.4*(Total revenue) + (Fixed Costs) Let the number of units sold be x. then, 7*x = 0.4*(7*x) + 6300 Thus, x = 6300/(0.6*7) = 1500 units. Thus the company will have to sell 1500 units to break even.</span>
8 0
2 years ago
Input-Output<br> 3 27<br> 8 72<br> 9 81<br> 5 45<br> 4 <br> what is the answer for the 4 number?
Mkey [24]

Answer:

Try 36

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
If (-1, y) lies on the graph of y=2^2x then y=
zubka84 [21]

Answer:

y is 1/4 when x is -1 if I did interpret your equation right. Please see that I did.

I believe the equation to be y=2^{2x}.  If you meant y=2^2x, please let me know.

Thanks kindly.

Step-by-step explanation:

If (-1,y) lies on the graph of y=2^{2x}, then by substitution we have:

y=2^{2\cdot -1}.  

We just need to simplify to determine y:

y=2^{2 \cdot -1}  

Multiply the 2 and -1:

y=2^{-2}

Use reciprocal rule for exponents to get rid of the negative:

y=\frac{1}{2^2}

2^2 just means 2(2):

y=\frac{1}{2(2)}

y=\frac{1}{4}.

8 0
2 years ago
Georgia ran a 5-kilometer race. How many meters did she run?
kumpel [21]

Answer:

Georgia ran 5000 meters

Step-by-step explanation:

1 kilometer = 1000 meter

4 0
3 years ago
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