Eddie the elf made 15 toys one day in the workshop. Some were dolls and the rest were action figures. The number of action figures he made was one more than twice the number of dolls he made. Which systems shows how many dolls (d) and action figures (a) did Eddie make? a
d + a = 15 a = 2d + 1
b
d + a = 15 d = 2a + 1
c
2d+1a = 15
d
15 + 2d = a

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?

Here is another math questions. i will keep asking different questions. 4^2x=6