Explain and correct the error made by a student who simplified this expression. –2x + 7x + 8
(–2 + 7 + 8)x
13x

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|

Which shows a reasonable estimation for 124% of 42 using the distributive property?