Which two charges have a sum of 0?
a) +7 charge and +7 charge
b) −7 charge and −7 charge
c) +7 charge and −7 charge
d) +7 charge and 0 charge

Can someone me with this problem . show your work .

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Adoughnut shop charges $0.50 for each doughnut and $1 for a carryout box. shirley has $10 to spend. which inequality can be used to find d, the number of doughnuts she could have bought if she also wants them in one carryout box?