Fill in the blank to make the statement true. 1.( )+4 506-21 000=1 001

2.698-( )+711=1 388

3.109 006-( )-66 666=23 124

some questions I have already answered only that question make me confused​

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Solve the equation for x.3(6x - 1) = 12 i've tried doing the math and i can't find out what i'm doing wrong

Measure of angles 31 (x+4) (3x+9) me