Question

Will mark brainliest, 60 points

Answer 1

Answer:

$\boxed{ \bold{ \sf{ \: 1. \: \: \: \: \: 198}}}$

$\boxed{ \bold{ \sf{2. \: \: \: \: \: - 8}}}$

$\boxed{ \bold{ \sf{ 3. \: \: \: \: \: \frac{64}{343} }}}$

Step-by-step explanation:

1. Given, u = 20 , x = 4 , y = 7 , z = 10

$\sf{ \frac{u}{z} + x {y}^{2} }$

⇒$\sf{ \frac{20}{10} + 4 \times {7}^{2} }$

⇒$\sf{ \frac{20}{10} + 4 \times 49}$

⇒$\sf{ \frac{20}{10} + 196}$

⇒$\sf{ \frac{20 + 196 \times 10}{10} }$

⇒$\sf{ \frac{20 + 1960}{10} }$

⇒$\sf{ \frac{1980}{10} }$

⇒$\sf{198}$

2. $\sf{4( - 2)}$

Multiplying or dividing a positive integer by any negative integer gives a negative integer

= - 8

3. $\sf{( \frac{4}{7} ) ^{3} }$

⇒$\sf{( \frac{ {4}^{3} }{ {7}^{3} } })$

⇒$\sf{ \frac{4 \times 4 \times 4 }{7 \times 7 \times 7}}$

⇒$\sf{ \frac{64}{343} }$

Hope I helped!

Best regards! :D

Answer 2

Answer:

$\Huge \boxed{\mathrm{18. \ \ \ 198}} \\\\\\ \Huge \boxed{\mathrm{19. \ \ \ -8}} \\\\\\ \Huge \boxed{\mathrm{20. \ \ \ \frac{64}{343} }}$

$\rule[225]{225}{2}$

Step-by-step explanation:

18.

$\displaystyle \frac{u}{z} +xy^2$

u = 20, x = 4, y = 7, and z = 10.

$\Rightarrow \displaystyle \frac{20}{10} +(4)(7)^2$

$\Rightarrow \displaystyle 2+(4)(49)$

$\Rightarrow 2+196$

$\Rightarrow 198$

19.

$4(-2)$

Rewriting.

$\Rightarrow -(4*2)$

Multiplying.

$\Rightarrow -8$

20.

$\displaystyle ( \frac{4}{7} )^3$

Distributing the cube sign to the numerator and the denominator.

$\Rightarrow \displaystyle \frac{4^3 }{7^3 }$

$\Rightarrow \displaystyle \frac{64}{343}$

$\rule[225]{225}{2}$