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3 years ago

Help Me with this question please

Mathematics

2 answers:

artcher [175]3 years ago

4 0

Answer:

Step-by-step explanation:

The abs of y is 29 because 29 is positive

51 - 29 = 22

yan [13]3 years ago

4 0

Answer:

Step-by-step explanation:

The lines on the outside of the number makes it absolute value, causing the number to become positive.

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Rhian sat a maths test and an English test In the Maths test she scored 14 out of 17 In the English test she scored 31 out of 39

BabaBlast [244]

Answer:

Rhian did better in the Math test.

Step-by-step explanation:

Given: Rhian scored $14$ out of $17$ in a Math test. In the English test she scored $31$ out of $39$ .

To find: In which test did she do better?

Solution:

We have,

Rhian scored $14$ out of $17$ in a Math test.

Rhian scored $31$ out of $39$ in an English test.

So, first we need to find the percentage of the marks scored.

Percentage in the Math test $=\frac{14}{17}\times100=82.35 \%$ .

Percentage in the English test $=\frac{31}{39}\times100= 79.49\%$ .

Clearly, the percentage in the Math test is greater than the percentage in the English test.

So, Rhian did better in the Math test.

8 0

2 years ago

<img src="https://tex.z-dn.net/?f=f%28x%29%20%3D%20%E2%88%923x2%E2%88%9211x%2B7" id="TexFormula1" title="f(x) = −3x2&minus

bixtya [17]

Answer:

$x= \frac{ - 11 + \sqrt{205} }{6} \: \: \: \: \: or \: \: \: \: \\x = \frac{ - 11 - \sqrt{205} }{6}$

Step-by-step explanation:

$- 3x {}^{2} - 11x + 7 = 0 \\ 3x {}^{2} + 11x - 7 = 0$

here,

$a = 3 \\ b = 11 \\ c = - 7$

now,

$D = b {}^{2} - 4ac \\ = (11) {}^{2} - 4(3)( - 7) \\ = 121 + 84 \\ = 205 > 0 \\$

so,

$x = \frac{ - b + - \sqrt{b {}^{2} - 4ac} }{2a} \\ \\ = \frac{ - 11 + - \sqrt{205} }{2(3)} \\ = \frac{ - 11 + - \sqrt{205} }{6} \\ \\ = \frac{ - 11 + \sqrt{205} }{6} \: \: \: \: \: or \: \: \: \: = \frac{ - 11 - \sqrt{205} }{6}$

4 0

2 years ago

What is the rate of change of the volume of the cylinder at that instance (in cubic kilometers per second)?

Kay [80]

Answer:

hello your question is incomplete attached below is the complete question

answer : -2400 π

Step-by-step explanation:

dr/dt = -12 km/s

h = 2.5 km

r = 40 km at some instant

hence the rate of change of Volume of cylinder at that instance

= dv / dt = $d(\pi r^h ) / dt$

= $\pi h\frac{d(r^2)}{dt}$ = $-\pi h *2r *dr/dt$

hence ; dv / dt = -2400 π

3 0

2 years ago

(20 POINTS!!!!) Jack can paint an entire house in 3 hours. Jill can do the same job in 4 hours. What portion of the house can th

Mariulka [41]

Answer: 7/12 portion

Explanation:

Jack can paint:

1 house = 3hr
1/3 portion= 1hr

Jill can paint:

1 house = 4hr
1/4 portion = 1hr

Both of them together can paint in 1 hour:

1/3 + 1/4 = 3/12 + 4/12 = 7/12 portion in 1hr

5 0

2 years ago

Read 2 more answers

Graph y+2 = -3/4(x+4)

Lera25 [3.4K]

Answer:

Slope: -3/4

y-intercept: (0,-5)

Step-by-step explanation:

Graph the line using the slope and y-intercept, or two points.

6 0

3 years ago