Answer:
175
Step-by-step explanation:
give brainlist
7:5 = 21:15
explanation : to get 21, multiply 7 by 3. since 7 is multiplied by 3, then you multiply 5 by 3 too. and you get 15.
Answer:

Step-by-step explanation:
We need to simplify out the given exponential expression . The given expression to us is ,
We can use the <u>Law of </u><u>Exponents</u> to simplify the given expression . Recall that ,

Note that , we can write ,
Therefore our expression becomes ,
Simpify using the Law of Exponents ,
Open the brackets in exponent ,
Simplify to get final expression ,

(34-12)÷2+7
22÷2+7
11+7
18
Hope this helps! If you want more details in case you don't understand, leave a comment, I'll reply as soon as possible! :)