Answer:
the answer is (6, -4)
Step-by-step explanation:
Answer:
a = 6
Step-by-step explanation:
Equate the two angles because opposite angles in a parallelogram are equal.
20a+30=17a+48
20a-17a=48-30
3a=18 (divide both sides by 3)
a=6
Given :
12 foot tall street light is making a 18 foot shadow at the same time a nearby building is making a 72 feet shadow.
To Find :
How tall is the building.
Solution :
Since, the time period is same so the angle angle of elevation is equal i.e the ratio of height of building is equal to height of shadow.
Let, height of building is h feet.
So,
Therefore, height of building is 48 feet.
Hence, this is the required solution.
Answer:
a. -5 ft per sec
b. 59.5 ft² per sec
Step-by-step explanation:
a. Suppose l represents the ladder, x represents the height of the top of ladder from the base of house and y represents the distance of base of ladder from the base of house.
By the Pythagoras theorem,
Differentiating with respect to t ( time ),
But, height of ladder, l = 13 ft = constant,
We have,
y = 5, ,
Again by equation (1),
From equation (2),
Hence, the rate of change of the height of the top of the ladder is -5 ft per sec.
b. Now area of the triangle = 1/2 × base × height
Differentiating with r. t. t,
= 59.5 ft² per sec
Hence, area of the triangle is changing with the rate of 59.5 ft per sec.
Answer:
Its unit price is $2.37
Step-by-step explanation:
unit price=$7.11/3
= $2.37
Please make me brainliest answer for that