The ratio of boys to girls in a class is 5 : 6. If there are 20 boys, how many girls are there?

Mathematics

2 answers:

Eduardwww [97]1 year ago

4 0

Answer:24

Step-by-step explanation:

Lilit [14]1 year ago

4 0

This symbol (:) is equivalent to a division sign. We can set up an equation; 5/6=20/x. For this specific problem, we can see that you can multiply 4 to reach 20. Then you can multiply 6 also by 4 and get 24. Generally, you should cross multiply. 5x=120; x=24. The final answer is 24 girls.

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If tan A= 1,what is the value of A

xxMikexx [17]

Answer:

45°

Step-by-step explanation:

Ok, so, there is one thing I need to point out. 45° is the 'main' value if you assume 0°<A<180°. However, sin, cos, and tan have different periods which means that there are infinite values of A where tanA = 1. The general notation that you could put is A = 45° + (n*180°) where n is just a number. For example, if n = 1, you would get an angle of 225°. If you plug tan225° into the calculator, you get 1. If you did radians, you could write A = $\frac{\pi}{2} + n\pi$ . But ignore that if you haven't. Basically, the answer would be 45° if you are assuming A is between 0° and 180°. Also, you could have just used your calculator and types inverse tan function ( $tan^{-1}$ ) and plug in 1 to find the primary answer of 45.