I need the tsa of a triangular prism

The answer is 840ft2

Step-by-step explanation:

for the two rectangles, use the formula: length x width

15 x 13 = 195

Since you have two rectangles on each sides, multiply by 2

45 x 2 = 390ft2

for the triangle, use the formula: base x height

                                                                    2

18 x 12

    2

=  108

since you have 2 triangles (one at the front, one at the back), multiply by 2

108 x  = 216ft2

For the rectangle on the bottom

18 x 13 = 234ft2

Add for the TSA

234 + 390 + 216 = 840ft2

55

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.