During this year, Laura read four less than twice the number of books ready by Stacy. If together, they read a total of 26 books, how many did Stacy read?

7.333333... or 22/3

Step-by-step explanation:

ok soo it goes like this

ok soo it goes like this - (first one) let 2x-4= laura

ok soo it goes like this - (first one) let 2x-4= laura - (second one) let x= stacy

ok soo it goes like this - (first one) let 2x-4= laura - (second one) let x= stacy soo Laura = 2x-4

ok soo it goes like this - (first one) let 2x-4= laura - (second one) let x= stacy soo Laura = 2x-4x + 2x + 4 = 26

ok soo it goes like this - (first one) let 2x-4= laura - (second one) let x= stacy soo Laura = 2x-4x + 2x + 4 = 263x + 4 = 26 ( add x & 2x)

ok soo it goes like this - (first one) let 2x-4= laura - (second one) let x= stacy soo Laura = 2x-4x + 2x + 4 = 263x + 4 = 26 ( add x & 2x)3x = 22 (subtract 4)

divide by 3

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m