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Sophie [7]
3 years ago
5

Pls answer this with an explanation if you can

Mathematics
1 answer:
Nuetrik [128]3 years ago
3 0

Answer:

The answer is D

Step-by-step explanation:

$13.95 divided by 100 = 1% which is equal to $0.1395

To get 15% of her bill, you need to multiply $0.1395 by 15 which gives you $2.0925. You then round this to 2 significant figures, which totals to $2.10.

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Part A. Write the equation 5 = 10x – 5y in slope-intercept form.
bagirrra123 [75]

Answer:

Slope intecept form: y=2x-1

Y-intercept: (0,-1)

and the slope is 2 if you nee it.

4 0
2 years ago
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A laboratory technician needs to make a 63-liter batch of a 20% acid solution How can the laboratory technician combine a batch
Gre4nikov [31]
Let x be the volume (liters) of pure (at 100%) acid needed
Let y be the volume (liters) of the other acid (at 10%) needed 
The final solution will be:
a) x+ y = 63 liters, AND their respective concentration in acid: is
100% x & 10% :y that will generate 63 liters at 20%
b) x +0.1 y = 63x 0.2 = 12.6

Let's solve this system of 2 equations:

x + y =63
x + 0.1 y = 12.6

Solving it will give you:

x= 7 liters at 100%
y = 56 liters at 10%
6 0
3 years ago
Read 2 more answers
A concentric-tube heat exchanger cools hot water owing at 1 kg/s from 80C to 30C. It uses air owing at 5 kg/s to perform this co
nordsb [41]

Answer:

The log-mean-temperature-difference is 24.03⁰C

Step-by-step explanation:

First we need to know if the heat exchanger is in parallel flow or counter-flow. However, counter flow arrangement is best used to recover heat.

L.M.T.D for counter flow is given as;

L.M.T.D =\frac{(T_h_f_1 -T_c_f_2)-(T_h_f_2 -T_c_f_1)}{2.3log[\frac{T_h_f_1 -T_c_f_2}{T_h_f_2 -T_c_f_1}]}

where;

Thf₁ is the initial temperature of the hot fluid = 80°C

Tcf₂ is the final temperature of the cold fluid = 51.5°C

Thf₁ - Tcf₂ = 80 - 51.5 = 28.5⁰C

Thf₂ is the final temperature of the hot fluid = 30°C

Tcf₁ is the initial temperature of the cold fluid = 10°C

Thf₂ - Tcf₁ = 30 - 10 = 20⁰C

L.M.T.D = \frac{28.5 -20}{2.3Log[\frac{28.5}{20}]} \\\\L.M.T.D = \frac{8.5}{0.3538} =24.03^oC

Therefore, the log-mean-temperature-difference is 24.03⁰C

3 0
2 years ago
Read 2 more answers
Indicate whether each equation is equivalent to this equation: 4x + 3 = 5/2x - 7
9966 [12]

Answer:y = 3 suh slid este ob cine este a, b și g au nevoie de acel kinfo pentru a termina

Step-by-step explanation:

8 0
2 years ago
If 7 sandwich rolls cost $1.26, how much will 25 rolls cost?
zavuch27 [327]
$4.5 since 1.26/7 is .14 and need 25 so it’s 4.5
4 0
2 years ago
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