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zhannawk [14.2K]
3 years ago
14

bryan runs 2 miles every 40 minutes. At this rate, how many minutes did Bryan run if he ran 8 miles?​

Mathematics
2 answers:
mars1129 [50]3 years ago
7 0

Answer:

160 minutes.

Step-by-step explanation:

2 miles per 40 minutes for 8 miles

dived 8 by 2 and then multiple by 40

lisov135 [29]3 years ago
6 0

Answer:

160 mins which is also 2 hours and 40 mins

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Find the value of x such that 365 based seven + 43 based x = 217 based 10.
Pepsi [2]

We need to find the base x in the following equation:

365_7+43_x=217_{10}

First, lets convert 365 from base 7 to base 10. This is given by

365_7=3\times7^2+6\times7^1+5\times7^0

where the upperindex denotes the position of eah number. This gives

\begin{gathered} 365_7=3\times49+6\times7+5\times1 \\ 365_7=147+42+5 \\ 365_7=194_{10} \end{gathered}

that is, 365 based 7 is equal to 194 bases 10.

Now, lets do the same for 43 based x. Lets convert 43 based x to base 10:

43_x=4\times x^1+3\times x^0

where again, the superindex 0 and 1 denote the position 0 and 1 in the number 43. This gives

43_x=(4x+3)_{10}

Now, we have all number in base 10. Then, our first equation can be written in base 10 as

194_{10}+(4x+3)_{10}=217_{10}

For simplicity, we can omit the 10 and get

194+4x+3=217

so, we can solve this equation for x. By combining similar terms. we have

197+4x=217

and by moving 197 to the right hand side, we obtain

\begin{gathered} 4x=217-197 \\ 4x=20 \end{gathered}

Finally, we get

\begin{gathered} x=\frac{20}{4} \\ x=5 \end{gathered}

Therefore, the solution is x=5

8 0
1 year ago
twice a number plus another number is 310. The difference between the two numbers is 55. What are the two numbers
Masteriza [31]
T us assume the two numbers to be "x" and "y".
Then
2x + y = 310
And
x - y = 55
Let us take the second equation and find the value of x in relation to y.
x - y = 55
x = y + 55
Now let us put the value of x in the first equation, we get
2x + y = 310
2(y + 55) + y = 310
2y + 110 + y = 310
3y = 310 - 110
3y = 200
y = 200/3
   = 66 2/3
Now putting the value of y in the second equation, we get
x - y = 55
x - (200/3) = 55
3x - 200 = 55 * 3
3x = 165 + 200
x = 365/3
   = 121 2/3
So the value of x is 121 2/3 and the value of y is 66 2/3

3 0
3 years ago
Read 2 more answers
What is the y-value in the solution to this system of linear equations?
baherus [9]

Answer:

Option  A.)−4

Step-by-step explanation:

we have

4x+5y=-12 -----> equation A

-2x+3y=-16 -----> equation B

Solve the system of equations by elimination

Multiply the equation B by 2

2*(-2x+3y)=-16*2

-4x+6y=-32 -----> equation C

Adds equation A and equation C

4x+5y=-12

-4x+6y=-32

-----------------

5y+6y=-12-32

11y=-44

y=-4

4 0
3 years ago
Read 2 more answers
Can you please help me with this
nadya68 [22]

Answer:

-The total area of a Rectangular Prism:

A = 366 in^{2}

Step-by-step explanation:

-To find the total area of a rectangular prism, you need this formula:

A = 2(l \cdot w +  l \cdot h + w \cdot h)

l = Length

w = Width

h = Height

-Apply the length, width and height for the formula:

A = 2(11 \cdot 8 +  11 \cdot 5 + 8 \cdot 5)

l = 11 in

w = 8 in

h = 5 in

-Then, solve for the area:

A = 2(11 \cdot 8 +  11 \cdot 5 + 8 \cdot 5)

A = 2(88 + 55 + 40)

A = 2(143 + 40)

A = 2 \times 183

A = 366

So, the total area would be 366 in ^{2}.

6 0
3 years ago
The U.S. Department of Education reported that in 2007, 67% of students enrolled in college or a trade school within 12 months o
MrRissso [65]

Answer:

a) The 90% confidence interval is 0.575\leq \pi\leq 0.701

b) The margin of error is 0.063.

Step-by-step explanation:

We have to construct a 90% confidence interval for the proportion of students enrolled in college or a trade school within 12 months of graduating from high school in 2013.

We have a sample of 160 students, and a proportion of:

p=X/N=102/160=0.6375

The standard deviation is:

\sigma=\sqrt{\frac{p(1-p)}{N}}=\sqrt{\frac{0.6375*0.3625}{160}}=0.038

As the sample size is big enough, we use the z-value as statistic. For a 90% CI, the z-value is z=1.645.

Then, the margin of error is:

E=z\cdot\sigma=1.645\cdot 0.038=0.063

Then, the 90% confidence interval is:

p-z\cdot \sigma\leq \pi\leq p+z\cdot\sigma\\\\0.638-0.063\leq \pi\leq 0.638+0.063\\\\0.575\leq \pi\leq 0.701

4 0
3 years ago
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