3 years ago

PLEASE ANSWER + BRAINLIEST!!!

Mathematics

1 answer:

quester [9]3 years ago

6 0

Use the Cosine Rule

q^2 = 20^2 + 30^2 - 2^20*30 cos 15

= 140.89

so q = sqrt 140.89 = 11.9 (answer)

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Why did the Europeans come to north america

ludmilkaskok [199]

Answer:

They wanted to spread Christianity. They also hoped to gain new lands and wealth for their countries. Finally, you read about the valuable cargo of New World plants that explorers brought back to Europe.

4 0

3 years ago

A trapezoid has an area of 24 square meters. The length of the bases of the trapezoid are 5 meters and 7 meters. What is the hei

Stella [2.4K]

As with any formula, fill in the values you know and solve for the one you don't know.

A = (b1 +b2)/2*h
24 m^2 = (5 m +7 m)/2 * h
24 m^2 = (6 m) * h
(24 m^2)/(6 m) = h
4 m = h

The height of the trapezoid is 4 meters.

8 0

3 years ago

Solve to find the values of a and b.<br>4a + 7b = 38<br>9a + 7b = 68

Nataliya [291]

4a + 7b = 38 -> (1)
9a + 7b = 68 -> (2)

Subtract (1) from (2),
9a - 4a + 7b - 7b = 68 - 38
5a = 30
a = 6

5 0

2 years ago

Which number best represents a helicopter ascending 112 ft? A. −112 B. +112 C. 112+ D. 112−

vampirchik [111]

Answer:

B +112

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

A weather plane took to the skies to measure the speed of the jet stream. The plane flew 1920 km with the jet stream as a tail w

Alex

For this case, the first thing we must do is define variables:
p: plane speed
w: wind speed
With the wind in favor, the speed is:
$p + w = 1920/2
$
With the wind against the speed is:
$p - w = 1920 / 3.2
$
Rewriting both equations, we have the following system of equations:
$p + w = 960

p - w = 600$
Then, solving the system of equations (graphically for example), we have the solution is:
$p = 780

w = 180$
Therefore, jet stream's speed:
$w = 180 km / h
$
Answer:
A) p + w = 960; p - w = 600; jet stream's speed = 180 km / h

7 0

3 years ago