Good 'ol ratio and proportion
so what yo do is
known ratio=unknown ratio
so first one
oranges
number of oranges to cost=5:2
find the cost of 2 dozen (24) oranges
number of oranges to cost=5:2
5:2=24:?
5/2=24/?
times both sides by 2 times ?
5 times ?=48
divide both sides by 5
?=9.6
2 dozen oranges costs $9.60
this one I can't see how many days
but for x days, the cost is x times $60
john drove some distance
distance to amount of gas is 48:2
how much gas needed for 78 miles
48:2=78:?
48/2=78/?
times both sides by 2?
48?=156
divide both sides by 48
?=3.25
used 3.25 gallons for 78 miles
Degree = 4
Maximum possible number of terms for = 5
Solution:
Given expression:
To multiply the trinomial by a trinomial:
Multiply each of the first term by the each of the second term.
Remove the brackets and arrange the terms with same powers together.
The product of the trinomials is 
.
Degree is the highest power of the variable.
Degree = 4
Maximum possible number of terms for = 5
The first one you pick goes with 2 and the exponent -5 on the top
The second one you pick goes into I think into the 2 and exponent -32
And the third one you pick goes into the 1
The last one matches with the last one
Ik I might be late or this might not help but
The sum of their ages is 50 so x + y = 50
If x - 10 = y then y + y + 10) = 50
50 = 2y +10
Subtract ten from both sides
40 = 2y
Divide by 2
Y = 20
And remember x - 10 = y
Then x - 10 = 20
Add 10 to both sides
X = 30
ANSWER: Alvin is 20, Elga is 30
