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irina1246 [14]
3 years ago
12

Which can be used to describe the expression? Check all that apply.

Mathematics
1 answer:
Burka [1]3 years ago
6 0

Answer:

B and D

Step-by-step explanation:

One thing is for certain. The final answer will be 1/r^12 or r^(-12)

When written as the given of (r^-4)^3, the powers are multiplied.

The first one is false. There are 4 factors of r^-4 If you get an answer that says it is true, then the question means that r^-4 is 3 equal factors of r^-12

B is true

C: not true. The exponents are multiplied, not added.

D is true

E: not true. This is the same thing as C.

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Jimmy decides to mow lawns to earn money. The initial cost of his electric lawnmower is ​$350. Electricity and maintenance costs
hodyreva [135]

Answer:

a) C(x) = 4x + 350

b) 13x; $13

c) 39

Step-by-step explanation:

a) Initial cost of lawnmower = $350

Maintenance cost for 1 lawn = $4

Maintenance cost for x lawns = 4x

Total cost function, C(x) = 4x + 350

b) Revenue = Cost + Profit

= C(x) + P(x)

= 4x + 350 + 9x - 350

= 13x

Charge per lawn = \frac{\text{Revenue}}{\text{Number of lawns}}

= \frac{13x}{13} = \$13

c) For Jimmy to make a profit, P(x) must be greater than zero i.e.

P(x) >0

9x-350 >0

9x >350

The smallest integer value of x that satisfies this inequality is 39. Therefore, Jimmy needs to mow 39 lawns in order to start making profit.

6 0
4 years ago
What is the equation of the line that passes through (4, -1) and (-2, 3)?
Rina8888 [55]
Y=mx+b

m=slope, b=y-intercept 

m=(y2-y1)/(x2-x1), b=value of y when x=0

m=(3--1)/(-2-4)

m=4/-6

m=-2/3, now we have:

y=-2x/3+b, we can solve for b using any point, I'll use (4,-1)

-1=-2(4)/3+b

-1=-8/3+b

-3/3+8/3=b

5/3=b so

y=-2x/3+5/3
3 0
3 years ago
Read 2 more answers
Help me please i needa get this done
SpyIntel [72]
The answer is D because your b-value (in the formula y= mx+b) is your y-intercept which is +6 (or simply just 6) and your y-intercept is always when x=0 so D is the correct answer
8 0
3 years ago
Read 2 more answers
Maryam has decided to build a rectangular garden against an existing brick wall. She wishes to enclose the largest possible area
liubo4ka [24]

Answer:

2500m²

Step-by-step explanation:

Maryam has an edging material which is 100m in dimension.

  To find the maximum possible area for this expanse of space, we must set the dimensions equal to that of a square

In essence, from the 100m edging material,  the maximum area would be:

        L = 50m and B = 50m

The largest possible area = l x b  = 50 x 50 = 2500m²

5 0
3 years ago
1.Which answer below represents the
Oksana_A [137]
I think B because you would have to divide by 5 to get y by itself.

5 0
3 years ago
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