Cual es el 80% del inverso multiplicativo de 0,4? La diferencia entre el 90% y el 75% de un numero es 3 ¿cual es el numero?

El 75% de la mitad de un numero es 3 ¿cual es el numero?

Un camion que lleva 6.750 kilos de carga pesa (con carga incluida) 9000 kilos. ¿Que porcentaje del peso total corresponde al peso del camion?

Porfavor, si no saben no respondan, es para mañana, al que me responda le doy gracias ;>
pd:perdon por las faltas de ortografia

Asap for seven months an ice creams vendor collects data showing the number of cones sold a day (c) and the degrees above 70 degrees f the vendor finds that there is a positive linear association between c and t that is the best modeled by this equation c=3.7t+98 which statement is true? the model predicts that the average number of cones sold in a day is 3.7 the model predicts that the average number of cones sold i a day is 98 a model predicts that for each additional degree that the high temperature is above 70 degres f the total of number of cones sold increases by 3.7 the model predicts for each additional degree that the high temperature is above 70 degrees f the total number of cones sold increasingly by 98

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone

Simplify the algebraic expression 8y-2(y+4)