Will give you ! a section of earth's crust and solid upper mantle is called a. pangaea b. a continent c. a tectonic plate d. the lithosphere

Actually, the answer is C. Tectonic Plate.

Explanation:

Tectonic plates are made up of the Earth's Crust and the upper part of the mantle layer underneath the Earth's crust. But, together they would make up the lithosphere . So, the lithosphere is both of them combined, it's not asking on what makes up the whole layer but a section of this layer.  I hope I did an OK job at explaining!

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.