21- 7t + 3r - rt
<span>Group: </span>
<span>(21- 7t) + (3r - rt) </span>
<span>Factor out the common factors: </span>
<span>7 (3 - t) + r (3 - t) </span>
<span>Use the distributive property: </span>
<span>(3 - t) (7 + r) </span>
Answer:
50.05 cm^2
Step-by-step explanation:
Ok so first lets find the area of the rectangle before finding the attached triangle. You have to imagine a line separating this shape into a triangle and rectangle.
The rectangle's size is 6.5x5.5=35.75 cm^2
The rectangle's size is 11.7-6.5 to get the base length, which is 5.2
The height is 5.5
So it's 5.2*5.5/2=14.3 cm^2
14.3+35.75=50.05 cm^2
A virus has a volume of about 4.7 x 10⁻¹⁴ cm³
Therefore 4.1 x 10¹⁶ viruses have a volume of
(4.7 x 10⁻¹⁴)(4.1 x 10¹⁶) = 1927 cm³
Answer: 1927 cm³
