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goblinko [34]
3 years ago
5

Can someone help me with 2 please

Mathematics
1 answer:
mina [271]3 years ago
3 0
Rectangle RSTU
P = 2(9+6) = 2 (15) = 30

R'S'T'U' scale 1/3 to
P of R'S'T'U' = 30/3 = 10

answer.
4.   10 units
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An observer (O) is located 500 feet from a school (S). The observer notices a bird (B) flying at a 39° angle of elevation from h
Serhud [2]

Answer:

h=404.89

Step-by-step explanation:

We are looking for side h, which is opposite of the observer. We know that the side adjacent to the observer is 500 feet. We also know that the angle from the observer to the bird is 39°. Because we have these values, SOH CAH TOA tells us that we should use tangent, opposite over adjacent.

We can set up our equation as follows:

tan(39°)=h/500

We can then solve for h:

500*tan(39°)=h

h=404.89

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2 years ago
Select the expressions that are equivalent to 10 + 2x + 5y + 3x.
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Sum of all natural numbers from100to300 which are divisible by 4and 5 is​
My name is Ann [436]

If x is a number that is both divisible by 4 and 5, then

\begin{cases}x\equiv0\pmod4\\x\equiv0\pmod5\end{cases}

4 and 5 are coprime, so we can use the Chinese remainder theorem to solve this system and find that x=20n is a solution to the system, where n is any integer. Simply put, any multiple of 20 fits the bill.

Now, there are 11 numbers between 100 and 300 that are divisible by 20 (100, 120, 140, and so on). We have 20n=100 when n=5, so the sum we want to compute is

\displaystyle\sum_{n=5}^{15}20n=\boxed{2200}

4 0
3 years ago
A and B are complementary angles. If A = (x + 9) and m B = (7x – 15)° then find the measure of B.​
Marina CMI [18]

Answer:

coplementary \: angles \:  = 90° \\ (x + 9)° + (7x - 15)° = 90° \\ (8x  - 6)° = 90° \\ 8x = 90  + 6 \\ 8x = 96° \\ x = 12\\ angle \: B.  = ((7 \times 12)- 15) \\  = 69°

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3 years ago
I need help with 14, 15 and 16 plz ​
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14. Is 25 percent
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16.
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3 years ago
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