3 years ago

The expression sin 80 cos 70 + cos 80 sin 70 is equivalent to

Mathematics

1 answer:

vekshin13 years ago

8 0

Sin(70+80) = sin 150.......................

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the ages of three siblings total 32 years the middle child is 4 years older than the youngest and the eldest is twice as old as

krek1111 [17]

Answer: 5 9 18. The youngest child would be 5, the middle child would be 9, and the eldest would be 18 years old.

Step-by-step explanation: 5 + 4 = 9, 9(2) = 18 Hope this helps :D

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3 years ago

Using the graph to the right, write the ratio in simplest form. BD/AD

Romashka [77]

Answer:

$\frac{BD}{AD} = \frac{5}{7}$

Step-by-step explanation:

Coordinate of B = 1

Coordinate of D = 6

Coordinate of A = -1

BD = |1 - 6| = 5 units

AD = |-1 - 6| = |-7| = 7 units

$\frac{BD}{AD}$

Plug in the values

$\frac{BD}{AD} = \frac{5}{7}$

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3 years ago

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2 years ago

A counter top is 16 feet long and 3 feet wide. Tile costs $28 per square meter. How much will it cost to cover the counter top w

Schach [20]

I believe what you do is multiply 16 by 3 and then multiply that by 28

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3 years ago

Will mark brainliest!!

olga55 [171]

Subtract the two equation from each other
-3x-7y=-66
-10x-7y=-24
--------------------
7x =-42
x=-6
by substituting in equation 1
(-3)(-6)-7y=-66
18-7y=-66
-7y=-84
y=12
so to check we substitute in the first equation

(-3*-6)-(7*12)=-66
18-84=-66
-66=-66
we check the second equations
-10(-6)-7(12)=-24
60-84=-24
-24=-24

8 0

3 years ago