Someone please help me I’ll give out brainliest please don’t answer if you don’t know

Mathematics

1 answer:

Luda [366]2 years ago

4 0

Answer:

Look below

Step-by-step explanation:

First, use order of operation or the three o's. That tells you to do what's in the parentheses first. Find out what the x next to the 2 is. Then subtract. If you look at the key, it shows you most of the answer. One black and one white both equal 1. Solve the question then sneak a calculator and simplify. Use the blocks to drag down as much as your final answer is.

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Can you please help with both? :)

QveST [7]

Answer: 1. 12 2. 120

Step-by-step explanation:

1. so basically 9/6=18/x

since they are similir the'd have the same ratio

sooo you just solve for x (multiply 6 by 18, and then divide by 9) and you get 12

2. same thing except you put 6/10=12/x, and solve it (multiply 10 by 12 and divide by 6) and u get 20

dats how i would do it but there are other ways too im sure :)

hope this helps

8 0

2 years ago

How do i prove 2sec^2x-2sec^2xsin^2-sin^2x-cos^2x=1

kramer

$2\sec^2x-2\sec^2x\sin^2x-\sin^2x-\cos^2x=2\sec^2x(1-\sin^2x)-(\sin^2x+\cos^2x)$

Since $\sin^2x+\cos^2x=1$ , you have

$2\sec^2x(1-\sin^2x)-(\sin^2x+\cos^2x)=2\sec^2x\cos^2x-1$

and since $\sec x=\dfrac1{\cos x}$ , you end up with $2-1=1$ .