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2 years ago

.In which step below does a mistake first appear in

Mathematics

1 answer:

Dmitry [639]2 years ago

5 0

Answer:

step 2

Step-by-step explanation:

from -8(a+6) to -80 - 48 is incorrect

when you multiply -8 x a it's -8a not -80

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A x b = 400<br> a ÷ b = 4<br>how much is b

laila [671]

Answer:

4 x 100 = 400

400 ÷100 = 4

B= 100

Step-by-step explanation:

8 0

3 years ago

Pls help I don't understand:

sineoko [7]

Answer:

Part a) $T(d)=2d+30$

Part b) $T(6)=42\ minutes$

Step-by-step explanation:

Part a) Write an equation for T (d)

Let

d ----> the number of days

T ---> the time in minutes of the treadmill

we know that

The linear equation in slope intercept form is equal to

$T=md+b$

where

m is the slope or unit rate

b is the y-intercept or initial value

In this problem we have

The slope or unit rate is

$m=2\ \frac{minutes}{day}$

The y-intercept or initial value is

$b=30\ minutes$

substitute

$T(d)=2d+30$

Part b) Find T (6), the minutes he will spend on the treadmill on day 6

For d=6

substitute in the equation and solve for T

$T(6)=2(6)+30$

$T(6)=42\ minutes$

8 0

3 years ago

Vicki made a fruit tart and cut it into six equal pieces . vicki, silvia,and Elena each took 2 pieces of the tart home. vicki sa

frez [133]

Yes, Vicki's statement is true.
The fruit tart was split into 6 pieces and to find what 1/3 of 6 is, you'd have to divide 6/3 which equals 2. So, 1/3 of 6 is 2 and each girl took home 2 pieces (1/3) of the tart home

4 0

3 years ago

At the Apple orchard, Lisa picks 75 apples. Lisa picks 5 times more apples than Sharon picks. Write an equation that can be solv

fgiga [73]

Lisa picks 75

Lisa = L
Sharon = S

L = 5S
L = 75
75 = 5S
75/5 = 5S/5
S = 15

hope this helps

5 0

3 years ago

Read 2 more answers

Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.

Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$2x^{2} -8x-90$

equate to zero

$2x^{2} -8x-90=0$

$2=-1\\b=-8\\c=-90$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(2)(-90)}} {2(2)}$

$x=\frac{8\pm\sqrt{784}} {4}$

$x=\frac{8\pm28} {4}$

$x=\frac{8+28} {4}=9$

$x=\frac{8-28} {4}=-5$

therefore

The solutions are x=-5, x=9

6 0

3 years ago