I need help on 7 &8

A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, def

Rashid [163]

Answer:

0.0576 points²

Explanation:

$1\ gry=\frac{1}{10}\ line$

$1\ line=\frac{1}{12}\ inch$

$\frac{1}{10}\ line=\frac{1}{10}\times \frac{1}{12}\ inch\\\Rightarrow \frac{1}{10}\ line=\frac{1}{120}\ inch$

$\therefore 1\ gry=\frac{1}{120}\ inch$

$1\ point=\frac{1}{72}\ inch\\\Rightarrow 72\ points=1\ inch$

$\\\Rightarrow \frac{1}{120}\ inch=\frac{1}{120}\times 72\ points$

$1\ gry=\frac{72}{120}\ point\\\Rightarrow 1\ gry=0.6\ point$

$0.16\ gry^2=0.6^2\times 0.16\\\Rightarrow 0.16\ gry^2=0.0576\ points^2$

∴ Area of 0.16 gry² is 0.0576 points²

8 0

3 years ago

Identify the reaction type for each generic chemical equation. A + B → AB: AB → A + B: Hydrocarbon + O2 → CO2 + H2O: AB + CD →

Ghella [55]

Answer:

1. $A+B\rightarrow AB$ : Synthesis

$AB\rightarrow A+B$ : Decomposition

$Hydrocarbon+O_2\rightarrow CO_2+H_2O$ : Combustion

4. $AB+CD\rightarrow AD+CB$ : Double displacement

Explanation:

1. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: $Li_2O+CO_2\rightarrow Li_2CO_3$

2. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: $Li_2CO_3\rightarrow Li_2O+CO_2$

3. Combustion is a type of chemical reaction in which hydrocarbon is reacted with oxygen to form carbon dioxide and water.

Example:

$CH_4+2O_2 \rightarrow CO_2+2H_2O$

4. Double displacement reaction is one in which exchange of ions take place.

Example: $NaOH+HCl\rightarrow NaCl+NH_2O$

6 0

3 years ago

Read 2 more answers

A student drops a rock from a bridge to the water 12m below. How many seconds does it take the rock to hit the water?

ANEK [815]

R = $\frac{g t^{2} }{2}$
r - displacement or height
t - time taken
g = 10 m/s-2
t = square root from 2r/g = $\sqrt{ \frac{2 x 12}{10} }$ = 1.5 seconds

7 0

2 years ago

What is the difference between an observation and an inference?

Vinvika [58]

Explanation:

observation is something what you could observe from your organs like eyes ears etc and also it is what you observed during an event for an experiment but inference is what you decide to do after observation or an event.

the act of inferring (to derive by reasoning). Observation = an act or instance of noticing or perceiving.

Thank u!

5 0

3 years ago

A ball is thrown straight up from the ground with an unknown velocity. It reaches its highest point after 5.5 s. With what veloc

Maslowich

V = u + at
0 = u -9.8 x 5.5
u = 9.8 x 5.5 = 53.9 m/s

5 0

3 years ago