21- 7t + 3r - rt
<span>Group: </span>
<span>(21- 7t) + (3r - rt) </span>
<span>Factor out the common factors: </span>
<span>7 (3 - t) + r (3 - t) </span>
<span>Use the distributive property: </span>
<span>(3 - t) (7 + r) </span>
Answer: fraction
Step-by-step explanation:
Answer:
Probably 5
Step-by-step explanation:
This is an extremely confusing question. Whoever wrote it most likely had a typo.
The little box in the corner of the triangle means that is 90 degrees. if that is the case, this is a simple question:
Apply pythagorean theorem (a^2 + b^2 = c^2)
In this case:
3^2 + 4^2 = x^2
x^2 = 25
x=5.
HOWEVER: the two given angles are 60 degrees and 50 degrees.
Which does not work. It creates an impossible triangle.
We have 20% and 60% solutions and need 80 ml of 50%
A) x + y = 80
B) .20x + .60y = (80 * .5)
Multiplying A) by -.2
A) -.2x -.2y = -16 Then adding this to B) we get
.4y = 24
y = 60 ml of 60%
x = 20 ml fo 20%
Source: 1728.com/mixture.htm
The horizontal distance covered by pilot is 17,972.2 feet.
Step-by-step explanation:
Given,
Distance covered descending = 1000 feet
Diagonal distance = 18,000 feet
The horizontal distance will form a right triangle, therefore, we can find the horizontal distance by using pythagoras theorem.
Here,
a = 1000
b = horizontal distance
c = 18000
Taking square root on both sides
The horizontal distance covered by pilot is 17,972.2 feet.
Keywords: pyathoras theorem, square root
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