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Lesechka [4]
4 years ago
7

For 20 POINTS!! A train goes from Springfield, MA to Boston at a speed of 40 mph. On the return journey it moves at a speed of 8

0 mph. If the return journey takes an hour less than the outward journey, what is the average speed overall of the train?
Mathematics
2 answers:
DaniilM [7]4 years ago
8 0

Answer:

Magbilang kayo

Step-by-step explanation:

Magbilang kayo

Romashka [77]4 years ago
3 0

Answer:

53.33 mph

Step-by-step explanation:

sorry.. no explanation

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A flagpole is located at the edge of a sheer y = 70-ft cliff at the bank of a river of width x = 40 ft. See the figure below. An
Gnom [1K]
I would solve this using tangents.  Let h be height of flagpole.
Set up 2 right triangles, each with a base of 40.
The larger triangle has height of "h+70"
Smaller triangle has height of 70.

Now write the tangent ratios:
tan A = \frac{h+70}{40}  , tan B = \frac{70}{40}

Note: A-B = 9
To solve for h we need to use the "Difference Angle" formula for Tangent
tan (A-B) = \frac{tanA - tanB}{1+tan A  tan B}
Plug in what we know:
tan(9) = \frac{ \frac{h+70}{40} -  \frac{70}{40}}{1+ (\frac{h+70}{40})(\frac{7}{4})}
tan (9) = \frac{ \frac{h}{40}}{ \frac{7h +650}{160}} = \frac{4h}{7h+650}
h = \frac{650 tan(9)}{4-7 tan(9)}
h = 35.6
7 0
3 years ago
a CD usally sells for 14.00 if the CD is 30% off and sales tax7% whats the total price of the price of the CD including tax
Ostrovityanka [42]
First you will get the sale price.

you need to convert the percentage to a decimal and to do that you move the decimal over twice:

30% = .30

then multiply the CD price by the decimal

$14.00 X .30 = $4.20

then you have the sales price but you need to find the tax price
to do that you move the decimal of the tax percentage over twice

7% = .07%

then multiply by the price after the sale included

.07 X $4.20 = $0.29

you have how much the tax would be
to get the total price you add the tax to the sales price

$0.29 + $4.20 = $4.42

the price you would be paying for this CD including tax is $4.42

3 0
3 years ago
Cd an anyone help me pls
Burka [1]

Answer:

ITS FALSE

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Step-by-step explanation:

3 0
3 years ago
Can any one figure this out plz
eimsori [14]

Answer:

(a)(b)=0.45

a/b=0.8

Step-by-step explanation:

a=0.6

b=0.75

(a)(b)=(0.6)(0.75)=0.45

a/b=0.6/0.75=0.8

4 0
3 years ago
Read 2 more answers
“a number n equals 7 more than half the number” can be written as what
sergiy2304 [10]

Answer:

Step-by-step explanation:

n=n/2 +7

3 0
3 years ago
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