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Svetllana [295]
3 years ago
8

Given that y=18 + 3x² (i) find the value of y when x= -2

Mathematics
2 answers:
vaieri [72.5K]3 years ago
8 0

Answer:

y= 6

Step-by-step explanation:

substitute x= -2 in the equation y=18+3x^2

from there you'll get your final answer

8_murik_8 [283]3 years ago
4 0

Answer:

y=30

Step-by-step explanation:

f(-2)=18+3(-2)^2

f(-2)=18+3*4

f(-2)=18+12

f(-2)=30

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Answer fast and show your work
Dahasolnce [82]

Answer:

$151.8

Step-by-step explanation:

126.5 + (126.5*20%)

the original cost plus the cost times the tip

4 0
3 years ago
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What is the volume of a right rectangular prism that is 3 meters by 4.5 meters
taurus [48]

Answer:

The volume is 81 m³.

Step-by-step explanation:

This is the right rectangular prism which dimensions are:

W = 3 m , L = 4.5 m , H = 6 m

The volume of the prism:

V = W * L * H

V = 3 m * 4.5 m * 6 m = 81 m³

6 0
3 years ago
Julia was creating similar triangles in the coordinate plane. The first triangle had a rise of 3 and a run of 10. The second tri
valina [46]

Yes julia is correct the run of the scond similar triangle will be b2=25.

<h3>What are simlilar traingles?</h3>

The similar triangle are those whose three sides or one angle or two sides or two angles one side are equal.

In the given:

Height of first triangle h=3

Base of first traingle =10

Height of second triangle =7.5

The base of second triangle b2 = ?

From the triangle similarity

\dfrac{h_1}{b_1}=\dfrac{h_2}{b_2}

\dfrac{3}{10}=\dfrac{7.5}{b_2}

b_2=\dfrac{7.5\times 10}{3}

b_2=25

Thus julia is correct the run of the scond similar triangle will be b2=25.

To know more about similar triangle follow

brainly.com/question/2644832

3 0
2 years ago
Noah is buying a pair of jeans and using a coupon for 10%off. The total price is $56.70 which includes $2.70 in sales tax. Noah’
lora16 [44]

Answer:

See below.

Step-by-step explanation:

So, we know that Noah's purchase can be modeled by the equation:

x-0.1x+2.70=56.70

Part 1)

The solution to the equation will be the value of x.

In this case, x will represent the original price of the jeans.

We know that Noah has a coupon for 10% off the <em>original price of the jeans</em>.

So, 0.1x will represent how much of the original price Noah gets a a discount on.

Therefore, (x - 0.1x) represents the total cost of the jeans <em>after</em> the coupon.

So, x is our original price of the jeans.

Part 2)

To verify that 70 is <em>not</em> a solution, we can simply substitute 70 for x and check whether or not the equation is true. So:

(70)-0.1(70)+2.7\stackrel{?}{=}56.70

Multiply:

70-7+2.7\stackrel{?}{=}56.7

Subtract:

63+2.7\stackrel{?}{=}56.7

Add:

65.7\neq56.7

However, we <em>can</em> verify that 60 <em>is</em> the solution by substituting. So, substitute 60 for every x:

(60)-0.1(60)+2.7\stackrel{?}{=}5.7

Multiply:

60-6+2.7\stackrel{?}{=}56.7

Subtract:

54+2.7\stackrel{?}{=}56.7

Add:

56.7\stackrel{\checkmark}{=}56.7

So, 60 is indeed the solution and is the value of x.

So, this means that $60 was the original price of the jeans.

8 0
3 years ago
Read 2 more answers
g Define two jointly distributed continuous random variables, X and Y, as the fluid velocities measured in meters/second at two
sergey [27]

Answer:

Attached is the complete question and solutions

7 0
3 years ago
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