Answer:
7
Step-by-step explanation:
If J is Joan's current age and E is Ellen's current age, then:
J = E + 5
(J - 3) + (E - 3) = 17
Solve the first equation for E:
E = J - 5
Substitute into the second:
(J - 3) + (J - 5 - 3) = 17
J - 3 + J - 8 = 17
2J - 11 = 17
2J = 28
J = 14
Joan is 14, so in 7 years, she will be 21.
Answer:
300 = x
Step-by-step explanation:
150= 100(.60) + x(.30)
150 = 60 + x(.30)
150 - 60 = 60 - 60 + x(.30)
90 = x(.30)
90/.30=x(.30)/.30
300 = x
You would do 0.04 because you moved the "pretend" decimal to the left 2 times. So then, it would be 0.04 x 140 = . Which would give you your answer of 5.6.
Answer:
2
Step-by-step explanation:
3*2+1 = 7
For this case we have the following mixed numbers:
We convert each mixed number into decimal:
Mercury orbits:
Venus orbits: 
Mars orbits: 
Answer:
Mercury orbits: 87.96
Venus orbits: 224.7
Mars orbits: 686.98
