We have two types of textbooks. Let's use "x" to represent the number of math textbooks and "y" to represent the number of history textbooks.
Altogether, the bookseller sold 240 math and history textbooks. So:
x + y = 240
Now, the number of history textbooks sold was 72 less than the number of math books sold. So:
y = x - 72
Now we can substitute for y in the equation and solve:
x + y = 240
x + (x - 72) = 240
2x - 72 = 240
2x = 312
x = 156
The bookseller sold 156 math textbooks.
Since y = x - 72, he must have sold 84 history textbooks.
Let's check our answers:
x + y = 240
156 + 84 = 240
That is true, so we did get the correct answers.
Answer:
136
Step-by-step explanation:
x = 1/2 (arc(XY) + arc(WZ) )
Arc (XY ) = 142
Arc(WZ) = 130
x = 1/2 (142 + 130)
x = 1/2 (272)
x = 136
Answer:
3(3x + y)
Step-by-step explanation:
Sorry if its wrong
Answer:
B, B, A.
Step-by-step explanation:
5x means 5 multiplied by x, so is it A, B or C? the product, because that means multiplied. a is B.
For b, we can see that 7 is a constant, because it isn't being multiplied by anything.
For c, 2y is 2 multiplied by y. Y would be the variable, and 2 would be the coefficient.
Answer:
Step-by-step explanation:
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394 384÷2
=197 192
197 192÷2
=98 596
98 596÷2
=49 298
49 298÷2
=24 649
24 649÷157
=157
157÷157
=1
Then 394 384 = 2⁴ × 157² = 4² × 157² = 628²
So 394 384 = 628²
So √(394 384) = 628
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