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kcnawlay170
14.02.2022 •
Mathematics
Ahmed sells different types of cake in his shop.
The cost of each cake depends on its type and its size.
Every small cake costs $x and every large cake costs $(2x + 1).
The number of small cherry cakes that can be bought for $4 is the same as the number of large
cherry cakes that can be bought for $13.
Find the cost of a small cherry cake.
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Ответ:
$0.80
Step-by-step explanation:
Let y be the number of cakes that can be bought then...
xy=4
y(2x+1)=13
Distribute the y to each term in the parentheses...
y(2x)+y(1)=13
2xy+y=13
xy=4
Multiply the second equation by 2...
2xy+y=13
2xy=8
Solve the equation using elimination (subtract the two equations and eliminate 2xy)...
y=13-8=5
Now, plug 5 back in for y to solve for x...
xy=4
5x=4
Divide both sides by 5
x=$0.80
Ответ:
A)
----------
-7 × 3= -21
18 × 3= 54
A IS WRONG!