T1 (Find the area of the circle with diameter 7 cm.)

The area of the circle is 38.5 cm²

Step-by-step explanation:

The rule of the area of a circle is A = π r², where

Let us solve the question

∵ The diameter of the circle is 7 cm

∴ d = 7 cm

∵ r = d

→ Substitute d by 7

∴ r = (7)

∴ r = 3.5 cm

→ Substitute the value of r in the rule of the area above

∵ A = π (3.5)²

∴ A = 12.25π

∵ π =

∴ A = 12.25 ( )

∴ A = 38.5 cm²

∴ The area of the circle is 38.5 cm²

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

1

step-by-step explanation:

it's the only multiple of both and the least