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3 years ago

HELP ASAP!!!! Need to get grade up

Mathematics

2 answers:

juin [17]3 years ago

6 0

Answer:

Option B and C

Step-by-step explanation:

$5^{-6}$ x $5^{4}$ / $5^{-4}$

$5^{-2}$ / $5^{-4}$ = $5^{2}$

$5^{2}$ = 25

Option B : 25

and C : $5^{2}$

I hope im right!!

Luden [163]3 years ago

4 0

The answer is 25 and 5^2

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a home improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a

Crank

Answer: $42.75

Step-by-step explanation:

Given: A home improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour.

Since, 1 hour = 60 minutes

1/4 hour = $\frac{60}{4}=15\ minutes$

If a customer rented the truck at 11:10 am and returned the truck at 1:40 pm the same day, what would his rental cost be

Time taken = 150 minutes

Since charge for first 75 minutes is fixed and charge of $4.75 for each additional 1/4 hour (15 minutes) is given by

The additional charge = $\frac{(150-75)}{15}\times4.75=23.75/tex]The total his rental cost =[tex]19+23.75=$42.75$

3 0

3 years ago

Can some body Help ASAP !!!

butalik [34]

Answer:

From the top of the list down, the answers are

6
-2
-3
1
13

3 0

3 years ago

Mr. Ratchett, an elderly American, was found murdered in his train compartment on the Orient Express at 7 AM. When his body was

nasty-shy [4]

Answer: Mr. Ratchett died approximately at 2AM.

Step-by-step explanation: Newton's Law of Cooling shows the cooling rate between a body and the environment, by stating that the rate is proportional to the difference in temperatures between them.

Mathematically, it is represented as:

$\frac{dQ}{dt}=\alpha.A.(T_{s}-T)$

This differential equation solved, gives the solution:

$T(t)=T_{s}+(T_{0}-T_{s})e^{-kt}$

where

$T_{s}$ is temperature of the environment

$T_{0}$ is the initial temperature of the body

k is a parameter dependent of heat transfer coefficient, heat capacity and area of the body

t is time required to change the temperature

For the murder on the Orient Express, first determine parameter k.

In 1 hour, Mr. Ratchett's body decrease 1°:

$27=22+(28-22)e^{-1k}$

$5=6e^{-k}$

$e^{-k}=\frac{5}{6}$

$ln(e^{-k})=ln(0.834)$

k = 0.1823

Using the parameter, find estimate time:

$28=22+(37-22)e^{-0.1823t}$

$6=15e^{-0.1823t}$

$ln(e^{-0.1823t})=ln(0.4)$

0.1823t = 0.9163

$t=\frac{0.9163}{0.1823}$

t ≈ 5 hours

The body was found at 7AM. So, it took approximately 5 hours to cool down to 28° at that time. Therefore, Mr. Ratchett died at 2AM.

5 0

3 years ago

What are the zeros for both functions

sammy [17]

Answer:

the zero of a function is the value of x which makes the final value zero

First Equation:

So let 25 - 2x equal to 0

25 - 2x = 0

x = 12.5

Second Equation:

Let 2x² - 11x - 6 equal to zero

2x² - 11x - 6 = 0

2x² - 12x + x - 6 = 0 (Splitting the middle term)

2x(x - 6) + 1(x - 6) = 0

(2x + 1) (x - 6) = 0

So we can transpose either one of the brackets below the zero

(2x + 1) = 0 or (x-6) = 0

x = -1/2 or x = 6

5 0

4 years ago

Slice the system of equations below 4×+y=16 and 2×+y=-2

BartSMP [9]

Answer: x = 9, y = -14

Explanation:

4x + y = 16
2x + y = -2

 4x + y = 16
- 2x + y = -2
-------------------
2x + 0 = 18
-------------------

2x = 18
x = 9 <<<<< ¯\_(ツ)_/¯ For the value of x

Plug x = 9 into 2x + y = -2

2(9) + y = -2
12 + y = -2
y = -14 <<<<< ¯\_(ツ)_/¯ For the value of y

5 0

4 years ago