All categories

3 years ago

Help answering these math questions

Mathematics

2 answers:

Leto [7]3 years ago

5 0

I’m pretty sure the first one is c

Gwar [14]3 years ago

5 0

Answer:

Step-by-step explanation:

1. $y = x^{2} - 2x- 15 = x^{2} - 5x +3x -15 = x(x-5) + 3(x-5) = (x-5)(x+3)$

$4x^{2} - 8x - 12 = 0\\x^{2} - 2x - 3 = 0\\x^{2} - 3x + x - 3 = 0\\ x(x-3) + 1 (x-3) = 0\\(x-3)(x+1) = 0$

x= 3 and x = -1

3. $x^{2} - 36 = 0$

(x-6) (x+6) = 0

x = 6 and -6

You might be interested in

Ebi, Jose, Derell, and Asami measured their heights. Ebi's height was 2.5 cm greater than Jose's height. Jose's height was 3.1 c

irga5000 [103]

Start with assigning each person with a variable to represent their height

Ebi: e
Jose: j
Derell: d
Asami: a

Ebi'd height was 2.5 cm greater than Jose's height

j + 2.5 = e

Jose's height was 3.1 cm greater than Derell's

d + 3.1 = j

Derell's height is 0.4 cm less than Asami's height

a - 0.4 = d

Ebi is 162.5 cm tall

e = 162.5

So, plug in 162.5 into any of the above equations were there is a variable of e

j + 2.5 = e

j + 2.5 = 162.5

Subtract 2.5 from both sides of the equation

j = 160 cm

Jose's height is 160 cm

Now, plug in 160 into any of the above equations where there is a j

d + 3.1 = j

d + 3.1 = 160

Subtract 3.1 from both sides of the equation

d = 156.9 cm

Derell's height 156.9 cm

so, plug in 156.9 into any of the above equations where there is a d

a - 0.4 = d

a - 0.4 = 156.9

Add 0.4 on both sides of the equation

a = 157.3 cm

Asami's height is 157.3 cm

7 0

3 years ago

Read 2 more answers

Coretta is covering her locker door with crate paper. The door is shaped like a rectangle and has an area of 192 square inches.

Reika [66]

I think it’s C I’m not sure

3 0

2 years ago

Read 2 more answers

Three runners run along a 1.5 mile trail one Saturday

Reil [10]

Answer:need graph

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Find the volume of the composite figure. Round your answer to the nearest hundredth

pishuonlain [190]

Answer:

The volume of the figure is 590.71 mm³

Step-by-step explanation:

To solve this problem we have to find the volume of the cylinder and the volume of the rectangular prism and add them

To calculate the volume of a cylinder we have to use the following formula:

v = volume

h = height = 3.65mm

π = 3.14

r = radius = 3.2mm

v = (π * r²) * h

we replace the unknowns with the values we know

v = (3.14 * (3.2mm)²) * 3.65mm

v = (3.14 * 10.24mm²) * 3.65mm

v = 32.1536² * 3.65mm

v = 117.36mm³

To calculate the volume of a rectangular prism we have to use the following formula:

v = volume

w = width = 14.23mm

l = length = 10.08mm

h = height = 3.3mm

v = w * h * l

we replace the values that we know

v = 14.23mm * 10.08mm * 3.3mm

v = 473.347mm³

we add the volumes

v = 117.36mm³ + 473.347mm³

v = 590.707

round to the neares hundredth

v = 590.707 mm³ = 590.71 mm³

The volume of the figure is 590.71 mm³

3 0

3 years ago

White three measurements using Grams and three measurements using Milligrams that total 15.4 grams.

zhuklara [117]

1 gram = 1000 milligrams

a) You can pick any 3 <u>gram</u> numbers that add to 15.4 grams
For example, 5 , 3, 7.4 = 15.4 grams

a) You pick any 3 <u>milligram</u> numbers that add to 15.4 grams (or 154,000 milligrams)
For example, 50,000, 70,000, 34,000 = 154,000 milligrams

4 0

3 years ago