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jarptica [38.1K]
4 years ago
13

Brian drove 120 miles at a speed of 60 mph. He drove the same distance back home at an average speed of 40 mph. Brian adds the s

peeds and divides by two to come up with an average speed of 50 mph what is wrong with his reasoning? Find his average speed
Mathematics
1 answer:
Helen [10]4 years ago
4 0
This is how to find the average speed: the total distance ÷ the total number of hours
the total distance in this case is 120+120=240
the total hours is 120/60 + 120/40 =2+3=5
so 240/5=48
48 miles per hour

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I need help with this problem
Anarel [89]

The midpoint lines are half the opposite side length.

Line DE is given as 7 , So Line F = 7 x 2 = 14

Line EF is given as 12, so Line D = 12 x 2 = 24

Line DF is given as 16, so line E = 16 x 2 = 32


The perimeter is the sum of the 3 sides:

Perimeter = 14 + 24 + 32 = 70

6 0
4 years ago
A right triangle has side lengths of 0.6 meter and 0.8 meter. What is the length of the hypotenuse? Round to the nearest tenth.
Sonja [21]

Use the Pythagorean theorem since you are working with a right triangle:

a^2+b^2=c^2a2+b2=c2

The legs are a and b and the hypotenuse is c. The hypotenuse is always opposite the 90° angle. Insert the appropriate values:

0.8^2+0.6^2=c^20.82+0.62=c2

Solve for c. Simplify the exponents (x^2=x*xx2=x∗x ):

0.64+0.36=c^20.64+0.36=c2

Add:

1=c^21=c2

Isolate c. Find the square root of both sides:

\begin{gathered}\sqrt{1}=\sqrt{c^2}\\\\\sqrt{1}=c\end{gathered}1=c21=c

Simplify \sqrt{1}1 . Any root of 1 is 1:

c=c= ±11 *

c=1,-1c=1,−1

4 0
3 years ago
A 2-quart carton of yogurt costs $2.72 . What is the price per cup?
OlgaM077 [116]
Hey there!

There are 4 cups in one quart. So there would be 8 cups in 2 quarts. Divide 2.72 by 8. 0.34 is what you get. So the price per cup of yogurt is $0.34.

I hope this helps!
5 0
4 years ago
Read 2 more answers
A college uses the formula T(c)=4000+95c to determine the quarterly tuition, T, to charge students taking c credits.
Trava [24]

Answer:

a) y-intercept is 4000

b)T(18)=5710

Step-by-step explanation:

a) This is the equation of a line with slope 95 and y-intercept 4000.

The y-intercept represents the basic amount the student has to pay even if not taking any unit: $4000

b) T(18) represents the total amount to be paid by a student who is taking 18 units: T(18) = 4000 + 95*18 = 4000 + 1710 = 5710

So a total tuition of $5710

3 0
3 years ago
Please help ill give brainliest and explain the answer too please
Lubov Fominskaja [6]

Answer:

x2+8x+16

Step-by-step explanation:

Multiply (x+4)(x+4) to create the polynomial

5 0
4 years ago
Read 2 more answers
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