3 years ago

What is the first step to solve the following system of equations using substitution?

Mathematics

2 answers:

Rzqust [24]3 years ago

7 0

Solve for y in the first equation

romanna [79]3 years ago

6 0

Answer: Add to both sides

Step-by-step explanation:

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Find the exact length of the curve. x = 9 + 9t2, y = 6 + 6t3, 0 ≤ t ≤ 4

andrew11 [14]

ANSWER

$=102 \sqrt{ 17}$

EXPLANATION

The equation of the curve is:

$x = 9 + 9 {t}^{2}$

$y = 6 + 6 {t}^{3}$

We differentiate to obtain:

$\frac{dx}{dt} = 18t$

$\frac{dy}{dt} = 18t$

The length of the arc

$l = \int _0 ^{4} \sqrt{ {( \frac{dx}{dt} )}^{2} + {( \frac{dy}{dt} )}^{2} } dt$

This implies that:

$= \int _0 ^{4} \sqrt{ {( 18t )}^{2} + {( {18 {t}^{2} } )}^{2} } dt$

$= \int _0 ^{4} 18t \sqrt{ 1+ { {18 {t}^{2} } }} dt$

$=102 \sqrt{ 17}$

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3 years ago

John can eat 10 hot dogs in 4 mins. At this rate, how many hot dogs can he eat in 18 mins?

Alex

He eats 7 and a half in 18 minutes

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Plz help me i will give brainliest to u and five stars and like

lianna [129]

Answer:

20 1/4 or 6 3/4

Step-by-step explanation:

depending if you multiply 4 1/2 by 4 1/2 or 4 1/2 times 1 1/2

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3 years ago

a store sells skis buys them from a manufacturer at a wholesale price of $57. the stores markup rate is 35%. what price does the

Alex787 [66]

Answer:

118.25

Step-by-step explanation:

first you find what 1 percent of 57 is

than you take that a multiply it by 35

add that to 57 and you got your number

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3 years ago

A store manager at a local clothing store recorded the number of customers that visited the store each day for two weeks. 20, 24

krok68 [10]

Answer:

STEM ______ Leaf

2 ______ 0 0 2 4

3 _______ 6 8

4 _______ 2 7

5 ______ 5 7

6 ______ 1 2 3 5

Step-by-step explanation:

Given that data:

20, 24, 65, 36, 47, 55, 62, 20, 22, 63, 38, 42, 57, 61

STEM ______ Leaf

2 ______ 0 0 2 4

3 _______ 6 8

4 _______ 2 7

5 ______ 5 7

6 ______ 1 2 3 5

The unique numbers which starts each value is the stem while the second digit of each unique stem is the leaf.

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3 years ago