7. The formula for the area of a circle is A = nr2 . Which equation shows the formula in terms of r?

r = √A/n

Step-by-step explanation:

the formular given as the area of circle

A= nr²

now inorder to express the formula in terms of r is the same as saying that we should make r the subject of the formulae.

A= nr²

divide both sides by n

we have

A/n = nr²/n

A/n = r²

Since we are aske to express the formula interms of  r and not r²,

we are going to square both sides

A/n = r²

√A/n =( r²)²

√A/n = r

therefore

r = √A/n

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

idk

step-by-step explanation: