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3 years ago

A student raises her average grade from a 75 to a 90. What is the percent of the increase in the students average grade

1 answer:

5 0

Since grades are out of 100, you can just subtract 75 from 90 which is 15. the percent of increase in the student's grade is 15%

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Which of the following statements does NOT adequately describe a developmental progression?

Artyom0805 [142]

The statement which does not adequately describe a developmental progression is Choice C- A developmental progression is a skill check- list that four-years- olds must master to be prepared for kindergarten.

<h3>What is developmental progression?</h3>

The Developmental Progression of Functional Skills is a concept which describes the child's growth in which case, the child's develops relationship with family members and a sense of self in the process and this concept in discuss is not limited to four-year olds.

Read more on developmental progression;

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6 0

1 year ago

Help me with this urgent due in 5 min

solniwko [45]

Answer:

The last option

Step-by-step explanation:

4 0

2 years ago

The heat in the house is set to keep the minimum and maximum temperatures (in degrees Fahrenheit) according to the equation |x –

dmitriy555 [2]

$|x-72.5|=4 \\
x-72.5=-4 \ \lor \ x-72.5=4 \\
x=-4+72.5 \ \lor \ x=4+72.5 \\
x=68.5 \ \lor \ x=76.5$

The minimum and maximum temperatures in the house are 68.5°F and 76.5°.

5 0

3 years ago

Need help I'm getting it wrong I don't understand

ivanzaharov [21]

W/3-15=12
remember, you can do ANYTHING to an equaiton as long as you do it to both sides
get w by itself

$\frac{w}{3}-15=12$
add 15 to both sides
$\frac{w}{3}+15-15=12+15$
$\frac{w}{3}+0=27$
$\frac{w}{3}=27$
tiemes both sides by 3/1
$\frac{3w}{3}=27*3$
$(\frac{3}{3})w=81$
$1w=81$
$w=81$

5 0

3 years ago

A chemist is adding pure (100%) acid to a 12 liter solution that is 15% acid in order to increase it to 49% acid. How much pure

Dmitriy789 [7]

Answer:

1) 8 liters of pure acid

2) 27 liters of 35% ethanol

3) 8.2 liters of 30% acid

Step-by-step explanation:

The inicial amount of acid is 15% of 12 L, and the inicial volume is 12L.

Adding 'x' L of 100% acid, we have the amount of acid equal to 12 * 0.15 + x * 1, and the volume of 12 + x. The concentration is the amount of acid over the volume, so we have that:

(12*0.15 + x) / (12 + x) = 49/100

(1.8 + x)*100 = (12 + x) * 49

180 + 100x = 588 + 49x

51x = 408

x = 8 liters of pure acid

Similar to the solution above, for the second question we have:

(23*0.26 + 0.35*x) / (23 + x) = 30.86/100

(5.98 + 0.35*x)*100 = (23 + x) * 30.86

598 + 35x = 709.78 + 30.86x

4.14x = 111.78

x = 27 liters of 35% ethanol

For the third question, we have:

(10*0.5366 + 0.3*x) / (10 + x) = 43/100

(5.366 + 0.3x)*100 = (10 + x)*43

536.6 + 30x = 430 + 43x

13x = 106.6

x = 8.2 liters of 30% acid

3 0

3 years ago