-15 i think if not u just got to use the quadratic formula.
Answer:
just post a new one
Step-by-step explanation:
<em><u>4 pints of strawberries and 2 pints of blueberries are bought</u></em>
<em><u>Solution:</u></em>
Let "a" be the pints of strawberries bought
Let "b" be the pints of blueberries cost
Cost per pint of strawberry = $ 1.60
Cost per pint of blueberry = $ 2.30
<em><u>A shopper bought twice as many pints of strawberries as pints of blueberries</u></em>
Therefore,
a = 2b --------- eqn 1
<em><u>They spent a total of $11.00. Therefore we frame a equation as:</u></em>
pints of strawberries bought x Cost per pint of strawberry + pints of blueberries cost x Cost per pint of blueberry = 11

1.6a + 2.3b = 11 --------- eqn 2
<em><u>Substitute eqn 1 in eqn 2</u></em>
1.6(2b) + 2.3b = 11
3.2b + 2.3b = 11
5.5b = 11
Divide both sides by 11
b = 2
<em><u>Substitute b = 2 in eqn 1</u></em>
a = 2(2)
a = 4
Thus 4 pints of strawberries and 2 pints of blueberries are bought
Step-by-step explanation:
l= 3x+2cm
b=4cm
Perimeter of the rectangle= 68cm
Now, according to the formula, the perimeter of a rectangle= 2(l+b)
Therefore,
2(l+b)=68
2{(3x+2)+(4)}=68
2{3x+2+4}=68
2{3x+6}=68
6x+12=68
6x=68-12
6x=56
x=56/6
x≈9.33
In order to cross-check this answer, we compute in the values so therefore,
3x+2=3(9.33)+2=27.99+2=29.99≈30
Now, substituting this value in the formula we get,
2(30+4)= 68
The reason for cross-checking was to re-assure because of the decimal value of 9.33, that is why I approximated the expression to 30 in order to get the exact value of 68. otherwise using the decimal value of 9.33 computes an answer of 67.98 which off by a difference of 0.2.
Answer:
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Step-by-step explanation: