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4 years ago

Solve the equation using zero-product property

Mathematics

2 answers:

dusya [7]4 years ago

7 0

X=2 or -7(answer choice A)

IgorLugansk [536]4 years ago

3 0

A) 2, -7

This is because you can view each (x-2) and (x+7) as a number. Thinking like this you have two numbers multiplied together to give you 0. The only way to multiply two numbers and get 0 is if either one or both of the numbers are 0. (As anything times 0 is 0.) So:

(x - 2) could be 0 or (x + 7) could be 0

Mathematically:

x - 2 = 0 and x+ 7 =0
+2 +2 -7 -7
x = 2 x = -7

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A car travel 140 miles in 3 hours (with a constant speed). How far can it travel in 7 hours (with the same speed)?

soldier1979 [14.2K]

Answer:

326.666miles

Step-by-step explanation:

v=distance/time (v=d/t)

d=140 miles

t=3hrs

v=d/t, v=140/3, v= 46.666mph

v=46.666mph

t=7hrs

d=?

v=d/t, d=vt, d=46.666mph x 7hrs, d= 326.666miles

3 0

3 years ago

Last year the 6th grade had 350 students. This year the number Increased 36%. How many students are in this year's 6th-grade cla

kupik [55]

Answer:

476 Students

Step-by-step explanation:

36% of 350 = 126 Students

350 + 126 = 476 students

7 0

3 years ago

olivia has $180 to buy presents for her 3 sisters and 2 nephews. She wants to spend $15 more on each sister than she spends on e

koban [17]

So
if x is the number she spent on each sister and y is the number she spent on each nephew then
180=3x+2y

she wants to spend 15 dollars more on sisters than nephews
so
x=15+y
solve

we have
180=3x+2y and
x=15+y
subsitute 15+y for x

180=3(15+y)+2y
180=45+3y+2y
180=45+5y
minus 45 both sides
135=5y
divide both sides by 5
27=y

solve for x
x=15+y
x=15+27
x=42

she spent $42 on each sister

6 0

3 years ago

Amy wants to estimate 11% of $9.11. what is a good estimate of the answer

arsen [322]

Amy can estimate with 10% instead, so she can just simply move the decimal point of $9.11 to the right, and so it will be estimated to more than 91 cents.

3 0

4 years ago

Jade and Eliza went shopping at a mall. Jade spent $10 more than 5 times the amount that Eliza spent. Jade spent a total of $150

DaniilM [7]

Answer:

140

Step-by-step explanation:

Let total money spent by Eliza's be represented as x

Five times amount Eliza spent = 5x and total amount spent by Jade is $150

So it will be $10+ 5x =$150

5x= 150- 10

5x= 140

x = 140÷5

x= 28

........................

So therefore Eliza's amount spent = $28 and

5x$28 = $140

Jade spent $10 more equals $10+$140= $150(Total money spent by Jade).

8 0

3 years ago