- 13. What should be added to 1,25 a b-0.7 ab +5.75 ab' to get 5.01ab
14. Simplify the expressions and evaluate their values as directed.
(a) 3y(2y - 7) - 3(y - 4) - 63 for y = -2
(b) -P-\m- n?)-p?(? - m²) +n+lp? - F )+ m² (nº -p?) for 1 = 1, m= -2,n=-1, p = 2
15. How much smaller is 2x3 - 2x + 5 than 7 + 5x + 3x ?
16. How much larger is 8x? - 9y2 than 3x – 2y??
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16 The value by which (8x^2 - 9y^2)(8x

2

−9y

2

) is larger than (3x^2 - 2y^2)(3x

2

−2y

2

) is as follows:-

\begin{gathered}(8x^2 - 9y^2) - (3x^2 - 2y^2)\\= 8x^2 - 9y^2 - 3x^2 + 2y^2\\= 5x^2 -7y^2\end{gathered}

(8x

2

−9y

2

)−(3x

2

−2y

2

)

=8x

2

−9y

2

−3x

2

+2y

2

=5x

2

−7y

2

..

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have