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
saul85 [17]
3 years ago
11

Find the difference: 77/8-31/4

Mathematics
1 answer:
posledela3 years ago
3 0
77/8= 9.625 and 31/4= 7.75...so 9.625-7.75= 1.875
You might be interested in
Write an expression that sho how to use the halving and doubling strategy to find 28×50
swat32
28x50
14x100
7x200=14,000
8 0
3 years ago
A number exceeds its four-sevenths by 18. Find the number.
Andru [333]

Answer:

42

Step-by-step explanation:

let the number be x

4/7 of x

(4/7) × x

4x/7

As stated in the question:

x=4x/7+18

=x-4x/7=18

=(7x-4x)/7=18

=3x/7=18

3x= 18×17

3x= 126

x=126/3

x=42

5 0
1 year ago
Mind lending a hand here?
elixir [45]

Answer:

C

Step-by-step explanation:

8 0
1 year ago
Read 2 more answers
A metal beam was brought from the outside cold into a machine shop where the temperature was held at 65degreesF. After 5 ​min, t
ivolga24 [154]

Answer:

The beam initial temperature is 5 °F.

Step-by-step explanation:

If T(t) is the temperature of the beam after t minutes, then we know, by Newton’s Law of Cooling, that

T(t)=T_a+(T_0-T_a)e^{-kt}

where T_a is the ambient temperature, T_0 is the initial temperature, t is the time and k is a constant yet to be determined.

The goal is to determine the initial temperature of the beam, which is to say T_0

We know that the ambient temperature is T_a=65, so

T(t)=65+(T_0-65)e^{-kt}

We also know that when t=5 \:min the temperature is T(5)=35 and when t=10 \:min the temperature is T(10)=50 which gives:

T(5)=65+(T_0-65)e^{k5}\\35=65+(T_0-65)e^{-k5}

T(10)=65+(T_0-65)e^{k10}\\50=65+(T_0-65)e^{-k10}

Rearranging,

35=65+(T_0-65)e^{-k5}\\35-65=(T_0-65)e^{-k5}\\-30=(T_0-65)e^{-k5}

50=65+(T_0-65)e^{-k10}\\50-65=(T_0-65)e^{-k10}\\-15=(T_0-65)e^{-k10}

If we divide these two equations we get

\frac{-30}{-15}=\frac{(T_0-65)e^{-k5}}{(T_0-65)e^{-k10}}

\frac{-30}{-15}=\frac{e^{-k5}}{e^{-k10}}\\2=e^{5k}\\\ln \left(2\right)=\ln \left(e^{5k}\right)\\\ln \left(2\right)=5k\ln \left(e\right)\\\ln \left(2\right)=5k\\k=\frac{\ln \left(2\right)}{5}

Now, that we know the value of k we can use it to find the initial temperature of the beam,

35=65+(T_0-65)e^{-(\frac{\ln \left(2\right)}{5})5}\\\\65+\left(T_0-65\right)e^{-\left(\frac{\ln \left(2\right)}{5}\right)\cdot \:5}=35\\\\65+\frac{T_0-65}{e^{\ln \left(2\right)}}=35\\\\\frac{T_0-65}{e^{\ln \left(2\right)}}=-30\\\\\frac{\left(T_0-65\right)e^{\ln \left(2\right)}}{e^{\ln \left(2\right)}}=\left(-30\right)e^{\ln \left(2\right)}\\\\T_0=5

so the beam started out at 5 °F.

6 0
3 years ago
In complete sentences, explain how to draw a double number line representing a 1:4 ratio.
Yuri [45]

<u>Answer:</u>

<u>ratios equivalent to 1/3=2/6,3/9</u>

<u></u>

<u>Step-by-step explanation:</u>

<u></u>

<u>Double number line is a diagram used when. quantities have different units.</u>

<u></u>

<u>It shows each of the quantities on its own number line with corresponding pairs of values lined up.The values of each number line are not the same unless there is a 1:1 ratio between them.</u>

<u></u>

<u>some ratios equivalent to 1:3 are;</u>

<u></u>

<u>2:6,3:9,4:12,5:15,6:18,7:21,etc</u>

6 0
2 years ago
Read 2 more answers
Other questions:
  • Barb is going to cover a rectangle area 8 feet by 10 feet with rectangle paving blocks that are 4 inches by 8 inches by 2 inches
    13·1 answer
  • What equation is equal to 1+4(6p-9)
    15·1 answer
  • True or false a function can not have a repeat values in the range
    13·1 answer
  • How do you solve 3(m + 5 + 9m)
    10·2 answers
  • Question up there. ^<br> |<br>​
    12·1 answer
  • marco has a piece of wood that measures 9 x 1/10 6 x 1/100 4 x 1/1000 meter. how can this measurement be written as a decimal?
    14·1 answer
  • Solve for x assume that lines which appear tangent are tangent
    12·1 answer
  • Solve the system of equations.<br> 3x+4y=−23<br> x=3y+1<br> x=<br> y=<br> ​
    12·2 answers
  • A girl chooses an item atrandom from 12 shirts and 16 tops. What is the probability that the gir does not choose a shirt?​
    5·1 answer
  • In △ABC, we are told that c=11, ∡C=75∘, and ∡B=29∘. Solve for a and b.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!