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3 years ago

7

A motorboat left a harbor and traveled to an island at an average rate of 10 knots. The average speed on the return trip was 10

knots. If the total trip took 4.0 hours, how far is the harbor from the island?

1 answer:

Illusion [34]3 years ago

5 0

Answer:

A on edu2020

Step-by-step explanation:

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15x²у⁴ (over) Зху² =

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Answer:

5XY^2

Step-by-step explanation:

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Answer:

$\frac{5}{7}$

Step-by-step explanation:

Find the GCD (or HCF) of numerator and denominator

GCD of 25 and 35 is 5

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Find a1, for the arithmetic series<br> with S14 = - 420 and d = -6.

faust18 [17]

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$\bf \textit{sum of a finite arithmetic sequence} \\\\ S_n=\cfrac{n(a_1+a_n)}{2}\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{last term's}\\ \qquad position\\ a_1=\textit{first term}\\ \cline{1-1} n= 14\\ S_{14}=-420\\ a_{14}=a_1-78 \end{cases}\implies S_{14}=\cfrac{n(a_1+a_{14})}{2} \\\\\\ -420=\cfrac{14[a_1+(a_1-78)]}{2}\implies -420=7(2a_1-78)\implies \cfrac{-420}{7}=2a_1-78 \\\\\\ -60=2a_1-78\implies 18=2a_1\implies \cfrac{18}{2}=a_1\implies 9=a_1$

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3 years ago

From a point on the ground 12 ft. from the base of a flagpole, the angle of elevation of the top of the pole measures 53°. How t

torisob [31]

Answer:

4.75 feet

Step-by-step explanation:

Let the height of the flagpole be x

Sin 53 = x/12

x = 12 × Sin 53

x = 12 × 0.3959

x = 4.75 feet

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3 years ago